alternatives to bath foams
Early in the development of my foaming formula, I asked Carol Low whether there might be something other than foam added to bath water that'd satisfy the kids without hurting Gwen. Might they just like the slippery feel of soapy water? There are basically two other ways to get that, both involving dissolvng some of the soap-like materials your skin produces.
The first is to make the bath water alkaline. That's commonly done with bath salts made of sodium carbonate (washing soda, sal soda) or sodium sesquicarbonate (as needle-like crystals or pressed into cubes). However, the slipperiness you get that way, rubbing skin against skin, is of a slip...stick...slip...stick kind, unless the water's already fully softened.
The other way is with a non-alkaline (or low alkalinity) water softener, usually a phosphate salt such as sodium hexametaphosphate. When the water's fully softened, skin rubbing skin feels a little slippery. Even water that's fully softened by running thru a water conditioner won't feel slippery unless a pinch of alkali or water softening salt is used.
Carol said, "No, they want the bubbles." OK, but there are still 2 kinds of bubbles: those in the water, and those on top of the water. (See details.) The fizzy, non-foamy kind of bubble bath has seen a resurgence in popularity in recent years with bath fizzies and bombs, as well as electro-mechanical aerators.
But they wanted heaps of suds. There are pressurized soaps shot from cans for kids, but shaving cream had hurt Gwen's genitals worse than bubble baths, so that didn't look like a likely alternative. Still, for those who can stand ordinary bar/cake soap, I've a method for making heaps of suds in the shower or tub. Click the bubbles below to read.