Direct Dyes is also known as Substantive Dye. These type of dyes are usually cheap and easily applied. Direct Dyes are quite often azo colors, with certain likenesses to corrosive colors. They likewise have sulphonate usefulness, however, for this situation, it is just to improve solvency, as the negative charges on color and fiber will repulse one another. It can be used on a variety of materials including: cotton, paper, leather, wool, silk, rayon and nylon.
Direct colors can be connected well at low temperatures and are in this way appropriate for tie-coloring and batik work. For the most part, these colors are utilized where a high wash speed isn’t required.
Types of Direct Dyes
Dyes that are self-leveling (dyes of good migration or leveling properties)
Dyes are not self-leveling, but that can be controlled by the addition of salt to give level results.
Dyes that are not self-leveling and which are highly sensitive to salt.