When I dissolve a cup of soda ash in a gallon of water how many T-shirts will it treat? 
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Jacquardmod Jacquardmod
So we say use 1/4 of a cup per gallon for med ium shades and 1/3 of cup per gallon for darker shades.  When you use more you are speeding up the reaction and might cause the dye to strike more unevenly and reducing the amount of time that the dye is active.  Yes Soda ash makes the Procion daker, but it also "breaks" the dye molecule and inactivates it.  So more Soda ash is not always better.  Keep that in mind.

So how much will a gallon treat?  It will do quite a few.  It is as many as a gallon will soak into. I think that is around 10-15 shirts usually.  You can wring out the the shirts as well as you can and treat more of them with the same water.  
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