diff --git a/4dev/tests/Convert/CoreLibsConvertMathTest.php b/4dev/tests/Convert/CoreLibsConvertMathTest.php
index 95002850..6441ca79 100644
--- a/4dev/tests/Convert/CoreLibsConvertMathTest.php
+++ b/4dev/tests/Convert/CoreLibsConvertMathTest.php
@@ -156,12 +156,32 @@ final class CoreLibsConvertMathTest extends TestCase
 	public function providerMultiplyMatrices(): array
 	{
 		return  [
-			'single' => [
+			'[3] x [3] => [3x1]' => [
 				[1, 2, 3],
 				[1, 2, 3],
 				[14]
 			],
-			'double first' => [
+			'[3] x [3x1]' => [
+				[1, 2, 3],
+				[[1], [2], [3]],
+				[14]
+			],
+			'[3] x [3x1]' => [
+				[1, 2, 3],
+				[[1], [2], [3]],
+				[14]
+			],
+			'[1x3L] x [3x1]' => [
+				[[1, 2, 3]],
+				[[1], [2], [3]],
+				[14]
+			],
+			'[1x3] x [3x1]' => [
+				[[1], [2], [3]],
+				[[1], [2], [3]],
+				[1, 2, 3]
+			],
+			'[2x3] x [3] => [3x1]' => [
 				[
 					[1, 2, 3],
 					[1, 2, 3]
@@ -172,7 +192,18 @@ final class CoreLibsConvertMathTest extends TestCase
 					14
 				]
 			],
-			'double both' => [
+			'[2x3] x [3x1]' => [
+				[
+					[1, 2, 3],
+					[1, 2, 3]
+				],
+				[[1], [2], [3]],
+				[
+					14,
+					14
+				]
+			],
+			'[2x3] x [2x3] => [3x3]' => [
 				[
 					[1, 2, 3],
 					[1, 2, 3],
@@ -186,7 +217,37 @@ final class CoreLibsConvertMathTest extends TestCase
 					[3, 6, 9]
 				]
 			],
-			'tripple first, single second' => [
+			'[2x3] x [3x3]' => [
+				[
+					[1, 2, 3],
+					[1, 2, 3],
+				],
+				[
+					[1, 2, 3],
+					[1, 2, 3],
+					[0, 0, 0],
+				],
+				[
+					[3, 6, 9],
+					[3, 6, 9]
+				]
+			],
+			'[2x3] x [3x2]' => [
+				'a' => [
+					[1, 2, 3],
+					[1, 2, 3],
+				],
+				'b' => [
+					[1, 1],
+					[2, 2],
+					[3, 3],
+				],
+				'prod' => [
+					[14, 14],
+					[14, 14],
+				]
+			],
+			'[3x3] x [3] => [1x3]' => [
 				[
 					[1, 2, 3],
 					[1, 2, 3],
@@ -199,7 +260,7 @@ final class CoreLibsConvertMathTest extends TestCase
 					14
 				]
 			],
-			'tripple first, double second' => [
+			'[3x3] x [2x3] => [3x3]' => [
 				[
 					[1, 2, 3],
 					[1, 2, 3],
@@ -215,7 +276,24 @@ final class CoreLibsConvertMathTest extends TestCase
 					[3, 6, 9],
 				]
 			],
-			'single first, tripple second' => [
+			'[3x3] x [3x3]' => [
+				[
+					[1, 2, 3],
+					[1, 2, 3],
+					[1, 2, 3],
+				],
+				[
+					[1, 2, 3],
+					[1, 2, 3],
+					// [0, 0, 0],
+				],
+				[
+					[3, 6, 9],
+					[3, 6, 9],
+					[3, 6, 9],
+				]
+			],
+			'[3] x [3x3]' => [
 				[1, 2, 3],
 				[
 					[1, 2, 3],
@@ -226,7 +304,7 @@ final class CoreLibsConvertMathTest extends TestCase
 					[6, 12, 18],
 				]
 			],
-			'double first, tripple second' => [
+			'[2x3] x [3x3]' => [
 				[
 					[1, 2, 3],
 					[1, 2, 3],
diff --git a/composer.json b/composer.json
index 3f2c5950..2a90156b 100644
--- a/composer.json
+++ b/composer.json
@@ -10,7 +10,6 @@
         "phpstan/phpstan": "^1.12",
         "phan/phan": "^5.4",
         "phpstan/extension-installer": "^1.4",
-        "phpstan/phpstan-strict-rules": "^1.6",
         "phpunit/phpunit": "^9",
         "phpstan/phpstan-deprecation-rules": "^1.2",
         "yamadashy/phpstan-friendly-formatter": "^1.1"
diff --git a/www/admin/class_test.convert.colors.php b/www/admin/class_test.convert.colors.php
index 0254ce67..6754aa51 100644
--- a/www/admin/class_test.convert.colors.php
+++ b/www/admin/class_test.convert.colors.php
@@ -54,7 +54,7 @@ function display(string $color, string $text, string $text_add): string
 		["{COLOR}", "{TEXT}", "{CSS}"],
 		[
 			$color,
-			$text . ($text_add ? '<br>' . $text_add : ''),
+			$text . (!empty($text_add) ? '<br>' . $text_add : ''),
 			$css
 		],
 		$template
@@ -123,22 +123,16 @@ $hsl_from_hsb = Color::hsbToHsl($hsb);
 print "HSL from HSB: " . DgS::printAr($hsl_from_hsb) . "<br>";
 
 print "<hr>";
-print "<h2>LEGACY</h2>";
 
 // A(out of bounds)
 try {
 	print "C::S/COLOR invalid rgb->hex (gray 125): -1, -1, -1: "
-		. CoreLibs\Convert\Colors::rgb2hex(-1, -1, -1) . "<br>";
+		. (new Coordinates\RGB([-1, -1, -1]))->returnAsHex() . "<br>";
 } catch (\LengthException $e) {
-	print "*Exception: " . $e->getMessage() . "<br>" . $e . "<br>";
-}
-try {
-	print "\$C::S/COLOR invalid rgb->hex (gray 125): -1, -1, -1: "
-		. $color_class::rgb2hex(-1, -1, -1) . "<br>";
-} catch (\LengthException $e) {
-	print "**Exception: " . $e->getMessage() . "<br><pre>" . print_r($e, true) . "</pre><br>";
+	print "*Exception: " . $e->getMessage() . "<br><pre>" . print_r($e, true) . "</pre><br>";
 }
 print "<hr>";
+print "<h2>LEGACY</h2>";
 // B(valid)
 $rgb = [50, 20, 30];
 $hex = '#0a141e';
@@ -189,13 +183,16 @@ $s = rand(15, 70);
 $b = 100;
 $l = 50;
 print "RANDOM IN: H: " . $h . ", S: " . $s . ", B/L: " . $b . "/" . $l . "<br>";
-print "RANDOM hsb->rgb: <pre>" . DgS::printAr(SetVarType::setArray(Colors::hsb2rgb($h, $s, $b))) . "</pre><br>";
-print "RANDOM hsl->rgb: <pre>" . DgS::printAr(SetVarType::setArray(Colors::hsl2rgb($h, $s, $l))) . "</pre><br>";
+print "RANDOM hsb->rgb: <pre>"
+	. DgS::printAr(SetVarType::setArray(Color::hsbToRgb(new Coordinates\HSB([$h, $s, $b])))) . "</pre><br>";
+print "RANDOM hsl->rgb: <pre>"
+	. DgS::printAr(SetVarType::setArray(Color::hslToRgb(new Coordinates\HSL([$h, $s, $l])))) . "</pre><br>";
 
 print "<hr>";
 
 $rgb = [0, 0, 0];
-print "rgb 0,0,0: " . Dgs::printAr($rgb) . " => " . Dgs::printAr(Colors::rgb2hsb($rgb[0], $rgb[1], $rgb[2])) . "<br>";
+print "rgb 0,0,0: " . Dgs::printAr($rgb) . " => "
+	. Dgs::printAr(Color::rgbToHsb(new Coordinates\RGB([$rgb[0], $rgb[1], $rgb[2]]))) . "<br>";
 
 print "<hr>";
 
diff --git a/www/admin/class_test.math.php b/www/admin/class_test.math.php
index 287dc78f..d3af1f39 100644
--- a/www/admin/class_test.math.php
+++ b/www/admin/class_test.math.php
@@ -23,7 +23,6 @@ $log = new CoreLibs\Logging\Logging([
 	'log_file_id' => $LOG_FILE_ID,
 	'log_per_date' => true,
 ]);
-$_math = new CoreLibs\Convert\Math();
 $math_class = 'CoreLibs\Convert\Math';
 
 // define a list of from to color sets for conversion test
@@ -35,13 +34,9 @@ print "<body>";
 print '<div><a href="class_test.php">Class Test Master</a></div>';
 print '<div><h1>' . $PAGE_NAME . '</h1></div>';
 
-print "FCEIL: " . $_math->fceil(5.1234567890, 5) . "<br>";
-print "FLOORP: " . $_math->floorp(5123456, -3) . "<br>";
-print "FLOORP: " . $_math->floorp(5123456, -10) . "<br>";
-print "INITNUMERIC: " . $_math->initNumeric('123') . "<br>";
-
 print "S-FCEIL: " . $math_class::fceil(5.1234567890, 5) . "<br>";
 print "S-FLOORP: " . $math_class::floorp(5123456, -3) . "<br>";
+print "S-FLOORP: " . $math_class::floorp(5123456, -10) . "<br>";
 print "S-INITNUMERIC: " . $math_class::initNumeric(123) . "<br>";
 print "S-INITNUMERIC: " . $math_class::initNumeric(123.456) . "<br>";
 print "S-INITNUMERIC: " . $math_class::initNumeric('123') . "<br>";
diff --git a/www/lib/CoreLibs/Basic.php b/www/lib/CoreLibs/Basic.php
index 065ec63e..db57672a 100644
--- a/www/lib/CoreLibs/Basic.php
+++ b/www/lib/CoreLibs/Basic.php
@@ -1139,118 +1139,6 @@ class Basic
 
 	// *** BETTER PASSWORD OPTIONS END ***
 
-	// *** COLORS ***
-	// [!!! DEPRECATED !!!]
-	// moved to \CoreLibs\Convert\Colors
-
-	/**
-	 * converts a hex RGB color to the int numbers
-	 * @param  string            $hexStr         RGB hexstring
-	 * @param  bool              $returnAsString flag to return as string
-	 * @param  string            $seperator      string seperator: default: ","
-	 * @return string|array<mixed>|bool          false on error or array with RGB or
-	 *                                           a string with the seperator
-	 * @deprecated use \CoreLibs\Convert\Colors::hex2rgb() instead
-	 */
-	public static function hex2rgb(string $hexStr, bool $returnAsString = false, string $seperator = ',')
-	{
-		trigger_error('Method ' . __METHOD__ . ' is deprecated, use \CoreLibs\Convert\Colors::hex2rgb()', E_USER_DEPRECATED);
-		return \CoreLibs\Convert\Colors::hex2rgb($hexStr, $returnAsString, $seperator);
-	}
-
-	/**
-	 * converts the rgb values from int data to the valid rgb html hex string
-	 * optional can turn of leading #
-	 * @param  int    $red        red 0-255
-	 * @param  int    $green      green 0-255
-	 * @param  int    $blue       blue 0-255
-	 * @param  bool   $hex_prefix default true, prefix with "#"
-	 * @return string|bool        rgb in hex values with leading # if set
-	 * @deprecated use \CoreLibs\Convert\Colors::rgb2hex() instead
-	 */
-	public static function rgb2hex(int $red, int $green, int $blue, bool $hex_prefix = true)
-	{
-		trigger_error('Method ' . __METHOD__ . ' is deprecated, use \CoreLibs\Convert\Colors::rgb2hex()', E_USER_DEPRECATED);
-		return \CoreLibs\Convert\Colors::rgb2hex($red, $green, $blue, $hex_prefix);
-	}
-
-	/**
-	 * converts and int RGB to the HTML color string in hex format
-	 * @param  int    $red   red 0-255
-	 * @param  int    $green green 0-255
-	 * @param  int    $blue  blue 0-255
-	 * @return string|bool   hex rgb string
-	 * @deprecated use rgb2hex instead
-	 */
-	public static function rgb2html(int $red, int $green, int $blue)
-	{
-		trigger_error('Method ' . __METHOD__ . ' is deprecated, use \CoreLibs\Convert\Colors::rgb2hex()', E_USER_DEPRECATED);
-		// check that each color is between 0 and 255
-		return \CoreLibs\Convert\Colors::rgb2hex($red, $green, $blue, true);
-	}
-
-	/**
-	 * converts RGB to HSB/V values
-	 * returns:
-	 * array with hue (0-360), sat (0-100%), brightness/value (0-100%)
-	 * @param  int   $red   red 0-255
-	 * @param  int   $green green 0-255
-	 * @param  int   $blue  blue 0-255
-	 * @return array<mixed>|bool  Hue, Sat, Brightness/Value
-	 * @deprecated use \CoreLibs\Convert\Colors::rgb2hsb() instead
-	 */
-	public static function rgb2hsb(int $red, int $green, int $blue)
-	{
-		trigger_error('Method ' . __METHOD__ . ' is deprecated, use \CoreLibs\Convert\Colors::rgb2hsb()', E_USER_DEPRECATED);
-		return \CoreLibs\Convert\Colors::rgb2hsb($red, $green, $blue);
-	}
-
-	/**
-	 * converts HSB/V to RGB values RGB is full INT
-	 * @param  int    $H hue 0-360
-	 * @param  float  $S saturation 0-1 (float)
-	 * @param  float  $V brightness/value 0-1 (float)
-	 * @return array<mixed>|bool  0 red/1 green/2 blue array
-	 * @deprecated use \CoreLibs\Convert\Colors::hsb2rgb() instead
-	 */
-	public static function hsb2rgb(int $H, float $S, float $V)
-	{
-		trigger_error('Method ' . __METHOD__ . ' is deprecated, use \CoreLibs\Convert\Colors::hsb2rgb()', E_USER_DEPRECATED);
-		return \CoreLibs\Convert\Colors::hsb2rgb($H, (int)round($S * 100), (int)round($V * 100));
-	}
-
-	/**
-	 * converts a RGB (0-255) to HSL
-	 * return:
-	 * array with hue (0-360), saturation (0-100%) and luminance (0-100%)
-	 * @param  int    $r red 0-255
-	 * @param  int    $g green 0-255
-	 * @param  int    $b blue 0-255
-	 * @return array<mixed>|bool  hue/sat/luminance
-	 * @deprecated use \CoreLibs\Convert\Colors::rgb2hsl() instead
-	 */
-	public static function rgb2hsl(int $r, int $g, int $b)
-	{
-		trigger_error('Method ' . __METHOD__ . ' is deprecated, use \CoreLibs\Convert\Colors::rgb2hsl()', E_USER_DEPRECATED);
-		return \CoreLibs\Convert\Colors::rgb2hsb($r, $g, $b);
-	}
-
-	/**
-	 * converts an HSL to RGB
-	 * @param  int    $h hue: 0-360 (degrees)
-	 * @param  float  $s saturation: 0-1
-	 * @param  float  $l luminance: 0-1
-	 * @return array<mixed>|bool  red/blue/green 0-255 each
-	 * @deprecated use \CoreLibs\Convert\Colors::hsl2rgb() instead
-	 */
-	public static function hsl2rgb(int $h, float $s, float $l)
-	{
-		trigger_error('Method ' . __METHOD__ . ' is deprecated, use \CoreLibs\Convert\Colors::hsl2rgb()', E_USER_DEPRECATED);
-		return \CoreLibs\Convert\Colors::hsl2rgb($h, $s * 100, $l * 100);
-	}
-
-	// *** COLORS END ***
-
 	// *** EMAIL FUNCTIONS ***
 	// [!!! DEPRECATED !!!]
 	// Moved to \CoreLibs\Check\Email
diff --git a/www/lib/CoreLibs/Convert/Color/CieXyz.php b/www/lib/CoreLibs/Convert/Color/CieXyz.php
index d8fd927c..2784f3e8 100644
--- a/www/lib/CoreLibs/Convert/Color/CieXyz.php
+++ b/www/lib/CoreLibs/Convert/Color/CieXyz.php
@@ -264,7 +264,7 @@ class CieXyz
 	private static function linRgbToXyzD65(RGB $rgb): XYZ
 	{
 		// if not linear, convert to linear
-		if (!$rgb->get('linear')) {
+		if (!(bool)$rgb->get('linear')) {
 			$rgb = (new RGB($rgb->returnAsArray()))->toLinear();
 		}
 		return new XYZ(self::convertArray(Math::multiplyMatrices(
diff --git a/www/lib/CoreLibs/Convert/Colors.php b/www/lib/CoreLibs/Convert/Colors.php
index 52f3f9d8..b24747be 100644
--- a/www/lib/CoreLibs/Convert/Colors.php
+++ b/www/lib/CoreLibs/Convert/Colors.php
@@ -33,6 +33,7 @@ class Colors
 	 * @param  bool   $hex_prefix default true, prefix with "#"
 	 * @return string             rgb in hex values with leading # if set,
 	 * @throws \LengthException If any argument is not in the range of 0~255
+	 * @deprecated v9.20.0 use: new Coordinates\RGB([$red, $green, $blue]))->returnAsHex(true/false for #)
 	 */
 	public static function rgb2hex(
 		int $red,
@@ -53,6 +54,7 @@ class Colors
 	 *                                        or a string with the seperator
 	 * @throws \InvalidArgumentException if hex string is empty
 	 * @throws \UnexpectedValueException if the hex string value is not valid
+	 * @deprecated v9.20.0 use: new Coordinates\RGB($hex_string) (build string/array from return data)
 	 */
 	public static function hex2rgb(
 		string $hex_string,
@@ -91,6 +93,7 @@ class Colors
 	 * @param  int $blue        blue 0-255
 	 * @return array<int|float> Hue, Sat, Brightness/Value
 	 * @throws \LengthException If any argument is not in the range of 0~255
+	 * @deprecated v9.20.0 use: Color::rgbToHsb(...)->returnAsArray() will return float unrounded
 	 */
 	public static function rgb2hsb(int $red, int $green, int $blue): array
 	{
@@ -112,6 +115,7 @@ class Colors
 	 * @param  float $V   brightness/value 0-100 (int)
 	 * @return array<int> 0 red/1 green/2 blue array as 0-255
 	 * @throws \LengthException If any argument is not in the valid range
+	 * @deprecated v9.20.0 use: Color::hsbToRgb(...)->returnAsArray() will return float unrounded
 	 */
 	public static function hsb2rgb(float $H, float $S, float $V): array
 	{
@@ -133,6 +137,7 @@ class Colors
 	 * @param  int $blue    blue 0-255
 	 * @return array<float> hue/sat/luminance
 	 * @throws \LengthException If any argument is not in the range of 0~255
+	 * @deprecated v9.20.0 use: Color::rgbToHsl(...)->returnAsArray() will return float unrounded
 	 */
 	public static function rgb2hsl(int $red, int $green, int $blue): array
 	{
@@ -153,6 +158,7 @@ class Colors
 	 * @param  float $lum           luminance: 0-100
 	 * @return array<int,float|int> red/blue/green 0-255 each
 	 * @throws \LengthException If any argument is not in the valid range
+	 * @deprecated v9.20.0 use: Color::hslToRgb(...)->returnAsArray() will return float unrounded
 	 */
 	public static function hsl2rgb(float $hue, float $sat, float $lum): array
 	{
diff --git a/www/lib/CoreLibs/Convert/Math.php b/www/lib/CoreLibs/Convert/Math.php
index a20085f7..41eb7463 100644
--- a/www/lib/CoreLibs/Convert/Math.php
+++ b/www/lib/CoreLibs/Convert/Math.php
@@ -136,6 +136,28 @@ class Math
 	 *
 	 * It returns an array which is the product of the two number matrices passed as parameters.
 	 *
+	 * NOTE:
+	 * if the right side (B matrix) has a missing row, this row will be fillwed with 0 instead of
+	 * throwing an error:
+	 * A:
+	 * [
+	 *   [1, 2, 3],
+	 *   [4, 5, 6],
+	 * ]
+	 * B:
+	 * [
+	 *   [7, 8, 9],
+	 *   [10, 11, 12],
+	 * ]
+	 * The B will get a third row with [0, 0, 0] added to make the multiplication work as it will be
+	 * rewritten as
+	 * B-rewrite:
+	 * [
+	 *   [7, 10, 0],
+	 *   [8, 11, 12],
+	 *   [0, 0, 0] <- automatically added
+	 * ]
+	 *
 	 * @param  array<float|int|array<int|float>> $a m x n matrice
 	 * @param  array<float|int|array<int|float>> $b n x p matrice
 	 *
@@ -161,8 +183,9 @@ class Math
 		$p = count($b[0]);
 
 		// transpose $b:
+		// so that we can multiply row by row
 		$bCols = array_map(
-			callback: fn ($k) => \array_map(
+			callback: fn ($k) => array_map(
 				(fn ($i) => is_array($i) ? $i[$k] : 0),
 				$b,
 			),
@@ -175,7 +198,8 @@ class Math
 					array_reduce(
 						array: $row,
 						callback: fn ($a, $v, $i = null) => $a + $v * (
-							$col[$i ?? array_search($v, $row) ?: 0]
+							// if last entry missing for full copy add a 0 to it
+							$col[$i ?? array_search($v, $row, true)] ?? 0 /** @phpstan-ignore-line */
 						),
 						initial: 0,
 					) :
@@ -191,7 +215,7 @@ class Math
 
 		if ($m === 1) {
 			// Avoid [[a, b, c, ...]]:
-			$product = $product[0];
+			return $product[0];
 		}
 
 		if ($p === 1) {