Compare Strength of Soak

Before tie dyes are colored they must be soaked in a sodium carbonate solution that facillitates the binding of the colors to the fabric at a molecular level. The instructions suggest about 1 cup of soda ash to one gallon of water. The instructions also state that if the balance is not right, in either direction, that the results will not be as goo. A friend of mine, who is one of the finest tie dye artists in the world say "the more the merrier" so I intend to test this by doing a series of shirts soaked in a solution that starts at twice the recommended strength in increments of 25%, so there will be a feww at 1.75 recommende strength, down to half as strong as recommended.