Quote Originally Posted by SCWood View Post
It's not trick, I just want to prove that he carries the gene.

Just that he is a silver streak AND he is carrying a Liesen Line gene
"Liesen Line" isn't a stand-alone gene, it's just a line of the black pastel morph. IIRC they are in demand because they hold their colors (darker black and brighter orange) better than many others, though you can find plenty of non-Liesen black pastels that look great also.