Accidentally made a tint last 3 weeks longer with one dumb trick

I had a client last Thursday who was fading fast after 4 weeks, so I switched to a lower volume developer and let it process with heat instead of just timing it. Normally I'd ride the 20 volume hard, but I dropped to 10 and it grabbed way better on her grays. She texted me Sunday saying it looks freshly done, which never happens. Has anyone else messed around with heat processing on gray coverage and got a weird win like this?

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grantl941mo ago

Heat trick works every time on stubborn grays. Keep it secret.

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