Name: bri
Message: hey! i'm trying to dye my curtains and they're 50% cotton and 50% polyester, but i want to dye the polyester too not just the cotton. also i would like your opinion on what technique you think i should use, my curtains are just simple rectangle panels. thanks very much!

No dye will do a good job on polyester except for disperse dye, but I would not want to bother with this process for most curtains. It's a lot of trouble, and requires the use of a good large cooking pot which should never again be used for food, an expensive sacrifice if you do not dye often. See "Dyeing Polyester with Disperse Dyes".

It's a lot less trouble to dye only the cotton in this blend, even though the colors will be half as bright (or dark) as they would be if you were to dye 100% cotton. The best dye for cotton is fiber reactive dye, such as Procion MX dye; it is vastly superior to all-purpose dye, which tends to run in the laundry forever. See "How can I dye clothing or fabric in the washing machine?".