Quote Originally Posted by jbl View Post
Thanks for the help, here.

How concerned should I be about mixing the powders together? Can they go airborne easily? Do I need to worry about pets or others inhaling them? Do people typically wear masks while mixing or is that not necessary?

No, they are not going to go airborne -- think of crystalline powders such as table salt. Besides. you are not going to be mixing powders together. You will be dissolving them in water in the order that they are given in the formula. When one chemical has dissolved then you can add the next one.

The only exception is when dealing with Metol. In this case a small amount of the sodium sulfite is dissolved, then the Metol and then the rest of the sulfite. This is done because Metol dissolves only with difficulty in concentrated sodium sulfite solutions.