Need to combat warmth when covering grey hair
SOLUTION ... Try this
* use LH .01 Natural Ash Series in your mix
* LH extra natural ensures coverage e.g 66.0
* Drop 1 level from target colour when using .01
* Resistant mix 1:1 + 6% LH Developer * Optional extend processing time to 40mins
* Optional - Add 10% .2 Illuminates