Hair dye

Q:

1. Can we use hair colour dye and can we offer namaz.

2. What does shariyat say about colour dye and which colours can we use?

Voting

Q: The presidential elections will take place in France in May. Is it permissible for the Muslims to participate in the voting or not? Some say that it is not allowed to vote because the people who will be in power will not apply the laws of Allah? What are our dalail for this? And also, is it permissible for a Muslim to take part in the no-Muslim political party?