coco amide propyl betaine - are you meaning cocoamidopropylbetaine? The only sufactant that I am familar with that has a "mide" instead of "mido" in it is cocamide diethanolamine (DEA), which has been around for a while and I would not use. And cocamidopropyl betine, what Lori uses - CAPB is a amphoteric surf, been around a long time - use it as co-surf in almost every sythetic surf recipe I have. The problems with formulating multiple purpose synthetic bubble products is that what is good for one application is not always good for another. When I formulate my SkinTress bars which are multiple purpose skin and hair solid cleaners, the fomula must be good for hair first as it has the more picky PH. This results in a higher cost to wash the skin because the nice gentle surf, especially the solid ones are the more expensive and while most customers will invest more for shampoo they are not going to spend shampoo dollars for soap. Then there is the bubble bath issue, and most big bubbling flash foamers are not so good at cleaning and too high in pH for the hair. Just my thoughts and I have been formulating with surfs for over 6 years.