Name: biz
Message: hi, i have a pair of navy blue 100% cotton curtains, which i wish to dye a caramel/toffee colour. Can you please suggest the easiest method of achieveing this.
Thank you in advance for your assistance.
regards Biz

The problem with this project is that navy blue is a much darker color than caramel/toffee. Dye can be used to make fabric darker, never lighter.

However, 100% cotton fabrics can often be bleached to remove their color. Some dyes can be bleached, while others stay dark no matter what you do. You can use chlorine bleach or Rit brand Color Remover, in the washing machine. If you use Rit Color Remover, be sure to use as many boxes as are called for in the instructions for your size of washing machine.

(If your curtains have been dyed with indigo, the same dark blue dye used in blue jeans, it is important to avoid the use of Rit Color Remover, because this kind of dye has a special chemistry that turns an unattractive yellow color when exposed to the sodium hydrosulfite in the Rit Color Remover.)

After bleaching, if enough of the color is removed, you can use fiber reactive dye to color the fabric the desired color. Fiber reactive dye, such as Procion MX dye, is best purchased by mail-order from any of the suppliers on my Sources of Dye Supplies page. You can also use all-purpose dye, if it doesn't matter to you that the dye fades in the wash.