Dress & Attire

Dying creams

Q: I got to know that using dying creams is permissible if dyes are porous, but their is no indication on dying creams available in the market as to whether they are porous are not. How can I ensure whether my wudhu is valid or not?

Hair dye

Q: I want to ask that if I dye my hair using ordinary dying agents available in the market, would it be an obstacle for my wudhu? Moreover, is it permissible to use dye in black colour?