Name: Khadija
Message: I did not get the stuff related to polyester/cotton dyeing on your site. If we want to dye this blend in one bath(i.e. both the reactive and disperse in the same bath instead of two bath) then what are the parameters we need to consider besides what must be the properties of both the dyes to withstand in one bath giving good results and fastenesses from pastal shades to darker shades

The temperature and chemical requirements for the dye reaction of fiber reactive dyes, versus the dye deposition of disperse dye, are so different that the idea of combining both in one step seems bizarre. Disperse dye is applied at a boil, using a chemical to reduce the temperature needed for dye transfer, while reactive dyes, unlike direct dyes, are generally applied at considerably lower temperatures, and may actually degrade quickly when boiled.

There may be some industrial method for combining disperse and reactive dyeing into one step, using specialized equipment, but I am not involved in, or familiar with, industrial dye processes. I recommend that you consult John Shore's book "Blends Dyeing", published by the Society of Dyers and Colourists.