I stick blend to thoroughly mix everything together (emulsification) then start doing other things by hand, including whisking to light to medium trace.
Please excuse me for being so "dense" here Paul, but am I correct in understanding that you still do not add any heat? Even after emulsification?
It's funny that everything I have read so far (and I have read a lot!) says the ingredients should be heated in order for saponification to occur using the Cold Process method. This is why I'm so surprised to learn that you can make CP soap with room temperature ingredients and no added heat. But now that I think about it, your technique seems to make a lot of sense ...
After all, if saponification begins without adding heat from an external source and without pre-heating the ingredients, the chemical reaction will likely produce its own heat, and this self-generated heat may be enough to carry the rest of the reaction through to completion.
My guess is that thorough emulsification via stick blender is the key to your success with room temperature ingredients. A stick blender seems like a very effective (and very rapid) way to put a large number of fat molecules "in close contact" with all those alkali molecules in the lye solution. The more these two molecules contact each other, the more heat will be generated, thus reducing or eliminating the need to add heat externally.
If this is what's going on here, I can see why you do not have to heat your fats yet you still achieve trace!
What about gel stage, do you typically see this in your molds? I built a mold out of wood which should retain the heat and possibly encourage gel, but it would be nice to hear from an expert so I might know whether or not to expect to see a gel stage when using a technique similar to yours ...
Before I read your post about room temperature CP I was going to try using coconut oil at room temperature (about 80 degrees Farenheit in my location so it is already liquid here) with the hot lye solution that is created after stirring crystalline NaOH into the water. But now I think I'm going to mix the lye solution the day before so it will cool off to room temperature, then use a stick blender to mix both ingredients at my 80 degree room temperature -- and follow up with a slower whisk mixing method until I see trace.
By the way Paul, how far in advance have you ever mixed your lye solutions? From my high school chemistry (assuming I recall correctly) it seems this solution could be mixed weeks or months in advance yet still be every bit as good then as the day it was first mixed, assuming it is stored in air tight containers. Is this correct?