Traditionally, tie-dye is a pattern of color made by preventing the dye from reaching some areas of the material while vat dyeing others. Folding, tieing, stitching, crumpling or otherwise preparing the fabric inhibits the flow of the dye. Nowadays most folding, scrunching & twisting is done starting with the wet shirt flat on a plastic covered table. The pattern of the folds etc. and where the colors are squirted dictates the resulting design. Figure maybe 4 oz of dye liquid per average T-shirt. With experience, the end result can be predicted and controlled to some extent, but surprise is part of what makes tie-dye an exciting and interesting art form - and there will be plenty of surprises.
Caution! The soda ash solution is mildly caustic - it can irritate your skin. Wear gloves and eye protection. Rinse off at once to avoid eye and skin irritation.
Dye Formula:
* 8 oz. cup of warm water (not hot)
* 2 to 8 tsp. Procion dye (see * info on color list)
* 1 Tbsp. Urea (dissolve in hot water first).
* 1/4 tsp water softener (if needed)
* Sodium Alginate Thickener (A little to slow spreading, and control color, if desired.)
VARIATIONS & HELPFUL HINTS
QUICK EXPLANATION OF THE CHEMICAL PROCESSES INVOLVED IN TIE-DYEING
Fiber reactive dyes attach permanently to cellulose fibers using a covalent (electron-sharing) bond. These molecules carry a "chromophore" which absorb varying spectrums of the light, allowing only certain spectrums to reflect.
Covalent bonding is the one of the most basic and strongest types of chemical reactions. This reaction happens gradually over time depending on temperature and/or the Ph level of the surrounding environment.
The Soda Ash pre-soak raises the pH level of the garment or fabric to approximately 10.5. Raising the pH level of the solution that the fabric or garment is soaked in raises the level of negative hydrogen ions in the dyeing environment. The chemical bonding process uses these ions in the reaction. Pre-soaking in Soda Ash fixer solution is what allows the fiber reactive dyes to work at room temperature.
The reaction can also be aided with heat. Some tie-dyers have had success with using baking soda and microwaving their dyed articles. Since baking soda is a weaker alkali than Soda Ash, it must be accompanied by heat. Some people who are "chemically sensitive" choose to use this method.
The dye is allowed to react in a desirable host environment for up to 24 hours. After this time, the bonding sites on the cellulose should be saturated with dye molecules. Excess dye molecules that have not bonded permanently are washed away using warm water rinse and a dye-carrying detergent like Synthrapol.
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