black silkies can have black chick down without any white at all ( will make a good picture of that soon )
Here is a choco/bleu showgirl pullet :
E/E S/- (ou s+/-) Bl/bl+ choc/- Ml/Ml


And the chick down of a lavender cuckoo silkie ( heterozygote for cuckoo )should be : E/E S/S B/b+ lav/lav Ml/Ml


( sorry again , but my computer don't want to open the option to insert an image , so can someone change the links into pictures ? )