Scrying?

i agree or use this link

http://spellsandmagic.com/pentagrams2.html

Black mirrors are the SAFEST way to do it if you know how
it's best if you put yourself in a circle of SEA salt and the mirror in another one, of course it's never too safe so yeah it would be best if you cast some banishing before doing it and after and some protection spells and warding spells

Black mirror scrying is as safe as any other scrying method. I have never heard of anyone who used a black mirror to be hurt in anyway by it. If you are however uncomfortable with using a black mirror pick a different color. Any color you wish. The point to scrying is to see into the abyss and pull out the information you are seeking.

I've heard once you become skilled enough you can use a fingernail.