Thank You Laundress
For giving the background of the Dreft, (knew you'd have more info about that than I )
Freddy,
sorry I'm unable to post a link, (just not computer savvy) but if your interested, you can Google "Robert A Duncan P&G"
This article explains the story I mentioned above, better than I did, and is a interesting read.
Robert A Duncan made the trip to Germany in 1931, the Germans had previously been working with a "wetting agent" that was obtained from the "bile' of slaughtered cattle. This was due to necessity, because of the food shortage, and shortage of fats.
They were using this "wetting" agent for the dying of textiles.
As for the "soaps" used prior to "detergents" that we see in the vintage photo, one must realize that there was much more involved in creating "laundry" soaps, be that bars, or powdered, than most people realize.
It was more than just grating up a bar of bath soap. Laundry soap was made totally different than bath soap.
For effective laundry soap, or what was considered in 1935 to be effective, was the important purification process that soap makers used at that time. P&G being one of those "soap makers"
First was the choice of fats, and fat percentages used to make the soap, and the percentage of the NaOH (lye) used for saponification of the selected fats. Second, was then the removal of the glycerine from the soap, and the "purification" of. Which was the neutralization of any left over NaOH, (sodium hydroxide) And removal of about two thirds of the remaining water.
After this process, they had something very different than bath or facial soap.
In the right water conditions (water conditions being the operative words here) this type of soap can be very effective for cleaning.
Here in the U.S, after the WWII, (1945) Tide was introduced, and as Laundress has explained that by the 1950's quite a few "soaps" were bumped by detergents, or remade into detergents, using the same name as there former.