Hmmm, lets see if I can explain this as it was explained to me. The fact that Cameo is sex-linked tells us that the gene for that particular color is found on the sex chromosomes, the fact that Opal is not sex-linked tells us that the gene for that color is probably not located on the sex chromosomes. The fact that the genes for the 2 colors are located on different chromosomes means that a sex-linked color hen should be able to carry genes for a non-sex-linked color. If she is carrying both there is the chance they could blend as opposed to one being dominant and hiding the other. As Taupe is said to be a result of Blue and Purple, it would be a blending of the 2 colors, one sex-linked and one not sex-linked. Anyway, I believe I relayed that explanation accurately, if not @AugeredIn or @Arbor will be able to amend it.