I would think it should be sealed with something. As a test, lick the slate and see if you get a mineral or dirt taste. If so, this could transfer to the cheese. I wonder if mineral oil applied and buffed off might not seal it well enough. You can mix varnish and lacquer thinner 50/50 and rub it on. This penetrates more and does not leave as much of a surface of varnish.
Slate is natural.
You can get special varnish/sealer for it at tile stores.
Slate is a natural product found in the ground. A type of rock.
Slate is among the natural stones that can withstand high temperatures.
Yes, natural slate will withstand the heat of a hot pan.
man made
Maintaining a slate roof is very important to avoid your roof from getting damaged. To maintain the natural slate roofing can be beautiful, it can be extremely heavy and expensive. CertainTeed manufactures various roofing shingles to replicate the look of natural slate roofing.
Not over the varnish, no. You have to sand the varnish completely off and then apply the stain. I highly recommend that you hire a pro hardwood contractor, because that is my profession, and I have seen many floors that a homeowner tried to sand themselves and ruined. The sanders that we use are powerful, and if you don't know how to operate them properly, you will do damage to your wood floors.
Slate, coal, gas, petroleum, sea oil, clay salt, limestone and tin are all natural resources from Scotland. In addition, silica sand, gold, and slate are natural resources found there.
Welsh lamb
That people should be born with a clean slate.
use tile nippers to clip edges