preservative for gum.

Thanks to all those that have answered to my question.
It is up to now the first time that I prepare gum solution, it had used a
mark of paste, but they should have changed the formula because he/she no
longer works well.
I have decided to use 2 drops for oz of solution of carbolic acid to 15% as
preservative in this my first experience. If the mathematics don't lie, 200
ml. of gum solution they can be equal to 6.5 oz, with what I will put 13
drops of carbolic acid in my gum solution.
If it is not this way the calculation, please correct me.
Pardon for my English, text translated by computer.
Received on Sat Feb 28 09:13:45 2004