It will take 48 hrs for the henna to oxidize. The red should turn more dark and deeper colour. Immediately after colouring with henna the colour is always brighter and more orangy. Hope you will be more happy with the colour after it is "ready".

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3 a / low porosity / medium texture and density

Two daughters:
3 c / low porosity / fine texture / medium density
4 a / low porosity / fine texture / high density