Quote Originally Posted by Prof_Pixel View Post
I don't believe I'd recommend storing photo chemicals in aluminum bottles.
+1!

Also, good luck ensuring consistency from batch to batch.

Powdered chemistry is unpredictable - it is very difficult to ensure that it is homogeneous throughout, and generally it is impossible to tell when there is a problem (all white powder constituents tend to look similar).

If you mix it all at once, that problem solves itself. If not, there may be significantly different proportions of the various components that make up the powder at different locations in the package, and it may be impossible to ensure uniformity by re-mixing it.