It all has to do with powdered egg whites, though I don't understand why they have disappeared. I used to buy 10# buckets of Ateco MP through The Ultimate Baker for $85.00. It made perfect RI for me that was smooth with an opaque matte finish. They have since taken them out of their catalog but can still order them directly for $240.00 each. I tried Brill MP which I found from Sweet Wise. 25# for $32.00. It does the job but the consistency is gummy and looks translucent even when dry. I have since tried to buy just powdered egg whites in the grocery store and found that they have vanished from the shelves. I'm about a breath away from buying a food dehydrator and making my own custom blend.