I have a simple question about this formula. At the bottom I see that it says "Note: The loss of water is approx. 10%" I take that to mean the formula when completed weighs 10% less of the

**original total weight of the formula**because of the evaporation of water during the process. I just want to make sure that it is correct and that it doesn't mean that

**10% of the water phase**has evaporated!

Thanks!

David

## Comments

Since I try to minimize adding large amounts post emulsion...I add 10% additional water to my formulas (at the beginning). I lose at least that much as most of my formulas require 80C.

And yes....it is the water you are losing.

Lathering Shaving cream became quite popular starting in the 1920's and the formulas and ingredients lists from those times are still exactly the same on current products as they were back then because they work well! There are quite a number of books that contain formulas for this type of shaving cream dating back to that time especially in the 20's, 30's and 40's and they either can be found in cosmetic chemistry formula books or soapmaking textbooks. Cosmetic Chemistry procedure has changed greatly in the last 100 years so it is not unusual to look back at an old book and find some procedures that are now questionable. That is why I asked the questions I did.

I haven't noticed any current formulas (for any kind of products) that mention having an

evaporation percentagebut I have seen some that say you should add back any of the evaporated water to the batch of that particular product. Also, the procedures listed in these old books such as stirring something on heat for a certain period of timewould cause evaporationso I am now looking at the production procedures from some of these old formulas to see if they have techniques like those listed! That tells me something about that formula and answers the questions as to why some of the old formulas have larger water phases than the others!Because my batches are relatively small, I can easily add the amount of water that evaporated, the next day and homogenize it. A large production company probably can't do that quite as easily as I can. So it would behoove them to have a larger water phase to account for the water loss during their production which is why some of these old formulas have larger water phases. Because of this, it will tell me what size water phase I need in creating my formulation. So the formulas with procedures in them can tell me quite a bit more about them than those without! Obviously comparing phase size, ingredients and procedures can as well! Having this knowledge helps me to understand which old formula will be more helpful to me to create a new formulation!

Also, I did know

that it was the waterthat was evaporating in the formula because none of the other ingredients have the ability to evaporate I just needed to know if it was10% of the total formula (not the water phase)and if they had written it this way I wouldn't have felt the need to just verify what I thought all along! -"Note: The loss of water is approx. 10% (of the total formula)"

Thanks!

suswang8, I understand what you're saying about seeing the value of adding extra water ahead of time to cover the upcoming water loss during the manufacture of a shaving cream. My concern is about the sizes of the water phases in various old sample formulations and the fact that evaporation is not mentioned in the procedures for making each formula. For me it is a matter of my interpretation of a formula because only one formula so far has addressed the issue! I can use my years of making shaving cream to determine whether a certain water phase is too high or too low, decide whether I should add extra water ahead of time or weigh the batch and add it after and go from there! Having as many sample formulas as possible can be helpful and hopefully some patterns will emerge and help me get to the right place! I'm close, but I have one more hurdle to get through! Just determining the size of the Tea Stearate and readjusting the lye ratios accordingly and I'll be done! Regarding the "Note: The loss of water is approx. 10%" , I would think if they wanted you to add 10% of water back they would have said so. This seems to indicate that they see the 10% water loss as part of the formula and the manufacture of that formula. That's my take on that!

Thanks, everyone!