Soy powder as egg wash substitute?
I've read that soy powder and water can be mixed to make a substitute for the egg in an egg wash. I bought some soy powder- label says "soya protein powder", ingredients say "soya protein isolate (90% pure)", made by "Purely Bulk".
When I tried the wash, 1 tbs powder to 3 tbs water, it didn't come out shiny, it came out dull and brown.
Did I get the wrong thing? It was all my store had, if it's wrong what should I try to find?
If it's right, is there a formula I can use to make it look shiny?
Sorry for all the questions! :)