While testing in CAS, the colorful hair was randomly generated onto children of one adult with colorful hair and one adult with “natural” hair 9 times out of 20, and onto toddlers of the same parents 11 times out of 20. They are genetic – an adult sim with purple hair can have purple-haired offspring about 50% of the time, at the same ratio that other hair colors are passed onto children. All hair recolors are Maxis Match! My CC recolors add swatches to the original hair styles in the game, so that there won’t be two versions of each hairstyle/eyebrow in your menu – which I find annoying because it takes so much time to scan through them all that way.