TestFarbívDetecha-vysledkyHello after a week, and sorry for being late with the results. Sadly, noone of you guessed, maybe it was too difficult. The photo on the right shows also the color bags.

 

And here is the image from previous post together with the correct answers. Of course, I also add a table with more detailed descriptions:)

 

TestingFoodColorantsInSoap

 

A1: Indigo
A2: Blue mica
A3: Brown: E155 – Brown HT
B1: Yellow: E102- Tartrazine – FD&C Yellow 5 (C.I. 19140)
B2: Blue ultramarine
B3: Red: E124 – Ponceau 4R (C.I. 16255)
C1: Blue: E133 – Brilliant blue FCF (C.I. 42090)
C2: Orange: E110 – FD&C Yellow 6 (C.I. 15985)
C3: Green: E102- Tartrazine – FD&C Yellow 5 (C.I. 19140), E133 – Brilliant blue FCF (C.I. 42090).

Many colors are sensitive to pH and so we can expect them to change as the saponification reaction finishes and pH decreases in time. Please,  note, I used 0.12% of color in soap.

 

Color After pouring 24 later, soda ash appears 48 after pouring, soda ash is washed off
Yellow: E102- Tartrazine – FD&C Yellow 5 (C.I. 19140)
Green: E102- Tartrazine – FD&C Yellow 5 (C.I. 19140), E133 – Brilliant blue FCF (C.I. 42090).
Blue: E133 – Brilliant blue FCF (C.I. 42090)
E155 – Brown HT
 Red: E124 – Ponceau 4R (C.I. 16255)
E110 – FD&C Yellow 6 (C.I. 15985)

To conclude – these food colorants – except for blue, which is more of a violet – get at the end their intended color in soap. One important drawback is that these soaps color very much the water. Of course, there are many ways how to color soap naturally and I will be posting about this (experiments were already done!).

 

Soap well!