Rit Colorstay Dye Fixative - Does it Make a Difference when Dyeing Cotton?

Do you need the Rit Colorstay Dye Fixative https://amzn.to/2HJPMPZ to dye cotton yarns with rit dyes? Will it help with the overall colorfastness when you tie dye t-shirts? Let's investigate this step in the recommended dyeing process and dye 2 shirts and 2 miniskeins of KnitPicks Simply Cotton Worsted yarn http://shrsl.com/wcnv with Navy Liquid Rit Dye. (Affiliate Links) We will treat one shirt and one skein of yarn with the dye fixative, and leave the other set untreated. Then, we will put all of the dyed cotton fiber through multiple rounds in the washing machine with detergent to see if we can observe any differences.

VIDEO CONTENTS:
[0:00] Introduction
[0:56] Rit Colorstay Dye Fixative
[1:52] Folding the Tshirts. All of the cotton fibers (shirts and yarn) were presoaked in plain tap water for a minimum of 30 min
[2:56] The dyebath - 1 gallon (16 cups) water, 1/3 cup salt (the recommended proportion), and 1/3 cup of the Rit Navy Liquid dye. Adding the yarn and the shirts to the pot. Let it simmer for about 20 min, stirring occasionaly.
[4:13] After about 7 min
[4:35] After 20 min, removing all of the yarn and shirts from the dyepot.
[5:33] Opening up the shirts. Rinsing the shirts and yarn BEFORE adding them to the dye fixative
[7:53] Treating one shirt (4T) and one miniskein of yarn with the dye fixative. The other shirt and yarn were soaked in hot water with NO fixative.
[9:58] The fibers WITHOUT the fixative have a lot more bleeding
[10:24] Rinsing the shirt treated WITH fixative by hand
[11:24] Rinsing the shirt with NO FIXATIVE by hand
[13:00] Comparison before machine washing
[14:05] After machine wash #1
[15:10] After 3 machine washes
[17:15] The dry fiber and conclusions

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