I own a house built in 1910 with a slate roof. I had several loose and missing tiles on the roof. I am thinking to install some metal hooks on a slate roof.
The hooks are to support solar panels. It will be virtually impossible to use a roof ladder while installing the rails on the hooks.
This may not sound like a regular question but I want to know if I can walk on the roof without causing any damage? Don't worry, I will have a harness clipped around me.

I am also planning to change the color of the slate roof. Can you give me some suggestions on new which color should I go for?