From there, you have complete control over how gradually your gray disappears at the start by using every day, or every other day. When you've achieved the look you want—often within two to four weeks—you'll continue using Control GX three to four times per week for maintenance. Results can last up to eight weeks.
Also know, what has PPD in it?
Paraphenylenediamine (PPD) is a chemical substance that is widely used as a permanent hair dye. It may also been found in textile or fur dyes, dark coloured cosmetics, temporary tattoos, photographic developer and lithography plates, photocopying and printing inks, black rubber, oils, greases and gasoline.
How well does Grecian formula work?
When there's no melanin, hair becomes white. A: Grecian works with the hair's natural chemistry to produce a similar-acting pigment where the melanin used to be. It combines with the hair's protein inside the hair to gradually "reverse" the graying process and bring back natural looking color.
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