Yes. If he is silver you would get 100% Blue. Keep in mind that Lavender can look kinda like blue, so I would say keep the babies until they feather and look at the boys VS the girls. If the girls seems to have more of a brown tint to them, then I would say he is Lilac. If they all look the same, I would say he is Silver.
There are pictures here of each color. Maybe that will help you. http://worthitfarms.jigsy.com/ancona-colors
I had all the other colors at one point and it was easier to tell by comparison. Lavender and blue I can tell apart without any problem; it's the very light lilac and silver that I have a hard time telling apart. Also, this particular drake is very sparsely marked, so there aren't any big blocks of color that would make it more obvious. I sold my lilac drake; if I still had him, it would make it easier to compare. Oh, well.
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