How to dye shirts one color?
Pre-Wash your material. Make use of HOT water and 1/4 cup Synthrapol or Dharma Professional Textile Detergent (PTD) per machine load. This may eliminate any soil, grease, or any other gunk. Utilize Enzyme detergents to eliminate starch. Textiles addressed with permanent press, conditioners, sizing or liquid proofing, etc aren't advised. This might be a very important step. Pre-washing can really make a big difference. We also recommend constantly pre-washing so named PFD (made For Dyeing) materials, while you never know "where they've been". Also fingerprints trigger blotchy dyeing. Be sure the fabric is wet.
Dissolve your dye. Paste up the Fiber Reactive Dye with tepid water, smashing it with a spoon, like making gravy. Next, include about a cup of heated water (much more if you're dissolving a lot of dye, just as in black) into the dye paste which will make a well mixed slurry. Finally, add to the tub or container and stir to mix uniformly. (for dye dimensions )
Note: Some colors is harder to reduce than the others, especially some reds (including mixes with red inside, like purples, blacks, browns, etc.), as well as a number of the darker yellows. Utilize approx. 1 TBS of Urea dissolved in 1 glass tepid water to make your dye slurry as above. Urea is a wonderful dissolving agent. To avoid "freckles" of undissolved purple, you may also use some thin textile like 5 or 8mm Habotai silk or something like that similar in a funnel over your dye shower and filter your really thinned and dissolved dye. Re-paste up any dye caught into the filter which means you do not wind up skewing the last color.
Pour the required quantity of the Non-Iodized Salt* to the dye shower. Include Calsolene Oil (Optional—breaks surface tension to get more even, less streaky results; strongly suggested for large loads).