I was typing an update last night and the power blinked off. Lost everything I'd written. Ugh. So here's a brief re-write:
I did 3 dilutions yesterday. After the dilutions got a night's rest, any slight differences between the dilutions are more clear, so maybe the power blink was a good thing.
What was common to all: I diluted 200 g soap paste with 150 g of water (or water and glycerin) following Irish Lass' basic method of dilution (see Post #9). The diluted soap is a crystal clear liquid almost exactly the same golden yellow as the color of the olive oil is used. When used for handwashing, the soap starts out as a fluffy mass of large bubbles quickly followed by a dense foamy lather. I like the lather in quality and quantity. The diluted soap is thinner in viscosity than Dawn dishwashing detergent, but it is definitely not watery. The feel of a drop of diluted soap on dry skin is almost exactly the same as the skin-feel of Dawn -- thick, syrupy, slightly sticky.
Dilution #1. Paste + water. Dilutes a bit slower than #2 and #3. The foam/suds that formed from stick blending took
forevah! to dissipate. I kicked myself after making this dilution, cuz I realized I had forgotten to add the sodium lactate to the dilution water. Arrrgh!
Dilution #1a. This is dilution #1 fixed by adding 3% sodium lactate (SL) added several hours after the original dilution. The SL fell to the bottom of the diluted soap and formed a pile of unappealing jelly-like goop. When I mixed the goop into the soap, the soap became very slightly more jelly like. If you've ever made chicken stock, it's the difference between the thin watery texture of the starting broth and the subtle gelatinous mouthfeel of a finished stock made with lots of nice bones. Not a huge difference, but still important.
Dilution #2. Paste + water + 3% SL per Irish Lass' method. The paste softened a wee bit faster than #1, but I can't say the difference was earthshaking. This might be my relative lack of experience that's showing here, so consider the source! What I did see that was really different -- the foam/suds created by stick blending dissipated
much quicker with SL than without. After a night's rest, this dilution and #1a are basically the same as far as viscosity, texture on dry skin, and overall lather.
Dilution #3. Paste + water (126 g) + glycerin (24 g) + 3% SL. To explain this dilution -- My paste has more water and less glycerin than Irish Lass' (see Post #76). For this dilution, my dilution "water" included the "missing" glycerin (24 g). I reduced the water by the same amount so the total dilution liquid was still 150 g. The end result is a product similar in composition to Irish Lass' soap. After a night's rest, this dilution makes a slightly less abundant lather with more fluffy bubbles and less dense lather. The viscosity is also lower compared with dilutions 1a and 2 -- it is still syrup-y, but definitely thinner. My hypothesis before I made this dilution was the lather might be less with the added glycerin, but I was expecting the viscosity to be thicker.
Overall conclusions: I like the method of dissolving KOH directly in room temperature water, then adding the glycerin as I explain in Post #76. Advantage is the KOH dissolves quickly without added heat, but I still get the benefit of quick trace that the glycerin provides. I like the no-added-heat, no-long-cook method of making the soap paste -- it's easy, quick, and fun.