Henna mistake

Hi guys i made a mistake and mixed my Henna with Cold Water instead of warm water (60 C temperature) 😭 now it is sitting already on my hair, will it still work ? How Long should i leave it on my hair ? I wanted to dye my hair from Brown red to black

I used Khadi Henna, the ingredients Are on the picture

Hi guys i made a mistake and mixed my Henna with Cold Water instead of warm water (60 C temperature) 😭 now it is sitting already on my hair, will it still work ? How Long should i leave it on my hair ? I wanted to dye my hair from Brown red to black

I used Khadi Henna, the ingredients Are on the picture