Assalamu alaykum Ustadh Ahsana Allahu ilayk Is Wudu valid if we have chemical Henna on our hands? BarakAllahu feeki

With normal henna, the wudu is valid. I do not know what chemical henna is, but keep in mind, it has to do with whether it creates a layer that prevents water from reaching the skin. Normal henna does not do that.