Bath Bomb Mix Hardened Up

[PAgirl89]

My idea was to make bath bomb mixture and package it in 4x6 stand up zip bags in a powdered form instead of making shapes like a bath bomb.

So I mixed a couple of batches of 1 cup baking soda and a 1/4 cup of citric acid, added FO and soap dye. I put 5oz of the mixture in the stand up zip bags and after an hour or so, I went to add labels to the bags and some of them were as a hard as a rock.

The interesting thing is, out of the 6 bags I made, the ones I colored red, and orange were the only 3 bags that became hard, the others (blue, green, yellow, and purple) were fine and still very powdery.

The blue, yellow, green and purple colors I bought from one supplier, the red & orange colors I bought from a different supplier.

Why would the liquid colorant turn this mixture hard like that?

Edited October 16, 2011 by PAgirl89

[Scented]

I wish I had an answer for you. The only thing that I have seen with the mix I use is that too much moisture tends to do that. I wonder if one dye is more watered down than the others. :/