Here is a link I found, hopefully it will help you determine. Hopefully the link even works. I've never copy and pasted one before, so please forgive me if it doesn't. Maybe someone better at it will come along and help. lol
http://www.yorkietalk.com/forums/gen...rt-thread.html
Also, I have read somewhere here about the color in their eyes in a picture. If you take a pic and they have a green or blue eye then a silky coat. A red or amber colored eye, a cotton coat. Hopefully some of this info helps.