To be honest, I'd try to find another snake that would "show off" the trait well, like if you're pairing with a normal, don't pair it with a really dark one, etc. Of if you pair with a morph, same thing. It's up to you what you want to produce, though I agree that if it ends up being really subtle and you breed it to a morph, you may have to do another pairing to try to figure it out.