I am sharing AM's revised fool-proof method of bleaching knots. I can not guarantee perfect professional results on darker lace, sealed knots, double knots or jet black fabric dye.
The desired results are knots that are less visible without creating pseudo thinning, wide parts and awful bleached out roots.
I have seen results occur as soon as 10 minutes, but can take as long as 40 depending on the volume of developer you choose. You may choose 20, 30 or 40 volume.
I use 40 volume with a liquid lightener and powder bleach in equal amounts. The amount is very, very small. I use a bottle cap, such as the cap attached to a regular bottle of alcohol. I mix them all in a very small container along with a drop or two of red out and/or red gold color corrector.
I use a very soft brush. The brush must be extremely soft, such as an eyeshadow brush. I have used the smaller end of a frost/dye brush, however the bristles were very soft. Do not use rigid bristles.
So:
1. Wellite oil bleaching kit or Loreal bleaching/lightening kit with liquid lightener.
2. A very soft brush for applying the solution to the lace
3. A bottle cap / plastic teaspoon/wooden stick to stir and measure in equal amounts in a small plastic container.
4. Ardell Red Gold Color Corrector or RED OUT (or any product that claims to neutralize brassy red/orange tones.
5. A clarifying shampoo to wash out all of the product before deep conditioning
Once your solution is mixed, allow it to sit for a few minutes to activate. Take the tip of your brush and dip it. Then tap gently on the knots. Do not paint the lace thick, use pressure or slather on the bleach.
Gently tap on the knots. THERE IS NO NEED TO SLATHER ON BLEACH LIKE PEANUT BUTTER ON BREAD. Remember, this solution will begin to bubble and expand. Overexposure is not necessary. You can bleach the knots on one unit with a bottle cap of solution and still have some left over with great results.
Once you are done, you can watch it change color. All lace and knots are not the same, therefore you may need to adjust the time you leave yours on for your personal tastes. The time also depends on the volume of developer you choose for your desired results. You may only want light brown knots, rather than blonde knots.
The results you get should appear professional with virtually no giant mess to clean up and absolutely no roots to dye. If you must repair roots, and clean up a mess that means you did not follow instructions.
Good Luck should you choose to accept this mission.

Here are a few pics.
Edited by AshleysMom - Dec 29 2009 at 9:34pm