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How to dye previously dyed material from IKEA? Answered

I have a couple super large slip covers that some one gave me from IKEA that I want to change the colour of, they are both the same "indecisive light yuch green ".  I want to go to a plum colour.  The label says 100% cotton and not to use bleach, so.... of course I added tons of bleach, thinking this would strip out some colour. I tried to do that in the washing machine with just copious amounts of bleach, and to my surprise no colour washed out! 

It is a light green, so was thinking a crazy vibrant purple may be strong enough to change the colour, but am afraid it may go some weird gray-purple-brown colour instead.  Any pointers would be great thanks! 

Yeah, I know, do a test strip... trying to save a step based on someones experience.


I am actually using the slip covers as just large swaths of fabric to make a new smaller slip cover for a much smaller vintage sofa I just picked up. So I will be bypassing all existing seems and avoiding the nylon thread. Dyeing can be evil, tempted to dye it in one of those large galvanized garbage cans. i would put some sort of metal mesh down in the bottom and put it over a gas burner (outside) To keep the dye super hot the whole time. The new couch would totally support the purple, but would also work with an intense green, grasshopper maybe. The couch has enough character to pull it off!

Here's another problem to consider:  The stitching will likely stay the same color which might not be such a huge deal to you, but it will probably be something you notice every time you look at it.  The thread is probably some kind of nylon.

Dying really heavy fabric evenly is kinda, really tricky.  It might come out horribly and require several dye jobs, and you might eventually decide that black is a much better color only to wind up with some gray/purple/green streaks.  If you really hate the color, which is generally called sage green, go for it.  You might wind up with something you hate even more, but you might wind up with something you hate less.  Just don't go into it with a set idea of the exact color you're after.  As ChrysN mentioned, there is a color remover made by RIT, but I haven't found it to be as useful as bleach, borax, hydrogen peroxide, the sun, or some sort of combination.

Alternatively, you can try working with the fabric color and paint a pattern on it, or you can sew a new cover using the existing one as a pattern.

If it's a very deep plum it'll likely override the colour...

Forgot to mention, going to be using rit dye