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Why adding buffer to semi-permanent hair dyes?
I am formulating a semi-permanent hair dye and didn’t use any buffer. However, I think some benchmarks uses buffer in the ingredient lists.
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2 Replies
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Haven’t worked on these kinds of products, but my guess is maintaining certain pH range could be important for the dyes used and their stability.
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If using the Arianors or acid semi-perms, then pH is a major consideration. Lactate buffers work best, but at the low use levels (<1.0%) there shouldn’t be much pH drift so you can usually do without.
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