Bubble Bars are vaguely similar, in that you put them in the bath water, like bath bombs (fizzies). If you want to add bubbles to your bath bomb, you can, just add SLS, or SLSa, depending on your preference. I am sure you have heard that SLS may be considered harmful, as opposed to SLSa, which hasn't. Bubble Bars can be made in several different ways, some try to dupe L*sh's recipe, there are recipes on the net that is just comprised of baking soda, glycerin, cream of tartar and SLSa, fragrance oil, color and other additives if preferred. I have personally madee these and there is a little bit of tweaking involved, to your preference of course. There is another resipe that includes cocamide dea and cocamidopropyl betaine. One is a surfactant and the other is a thickener. In my opinion, these ingredients can be costly, I think either recipe would be ok, depending on your budget. Bubble Bars seem to be the new craze, they are like bubble baths, just in solid form. if I missed something, someone please follow behind me!!
Sonya