Question
Posted on: March 6 2013Tried to make glycerol ointment. Since wheat starch is not stocked at wholesale, I tried rice starch.
Preparation carried out as described in BF. Do not dissolve 6 g of salicylic acid in the heated glycerol. However, when stirring/cooling, NO thick translucent mass arises, but everything remains liquid and milky white. Is there a solution?
Answer
(with the collaboration of Apoth F. of Paris)
after a few tests the following shows:
- the glycerol ointment does not succeed with the salicylic acid dissolved and with the use of potato starch instead of rice starch
- The glycerol ointment does not succeed with rice starch even when salicylic acid is processed in the Cooled glycerol ointment
- the glycerol ointment succeeds with potato starch but salicylic acid must be processed in the cooled glycerol ointment.