mutation pairing

Hi my name is Oscar, im from Ohio and i LOVE😍 birds. Ive been breeding peachfaced lovebirds:lovie 1: for two years and have had cockatiels as pets only. Now i want to start breeding cockatiels. I have a lutino female:lutino:, A grey male:grey tiel:, and another male that i dont know if he is...

I have been interested in breeding tiels for a long time now but I have only recently been getting into the nitty gritty of genetics and I am currently compiling all the info I can on the subject. Something I have been having trouble finding though it what colour mutations should NOT be bred...