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The ebonizing solution is made with two common products: vinegar and steel wool. A plastic jar with a plastic lid is best to use because the lid won’t rust.
To make ebonizing solution put a coarse steel wool pad in the jar and pour in enough vinegar to cover it, loosely screw the lid on the jar. If the pad is not totally submersed rust will quickly form on the portion exposed to air. After about twenty-four hours pour the vinegar in another jar. Don’t squeeze the vinegar out of the pad or you may get bits of metal in the liquid, which will rust, then just brush the solution on the contoured project pieces you want ebonized.
taken from wood alley