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add_filter( 'generate_default_color_palettes', 'tu_custom_color_palettes' );
function tu_custom_color_palettes( $palettes ) {
$palettes = array(
'#ffffff',
'#f8f8f8',
'#B6B6B8',
'#010203',
'#C30DBD',
'#ffffff',
'#ffffff',
'#ffffff',
);

return $palettes;
}