Went to test some grayscale on slate and it became a set of popular, recognizable characters. While the dry looks cool (though the enclosure LEDs are bleaching them a little) where they really shine (trolol?) is when in use and catch condensation and become wet.
Dry together:
Samus Wet:
Mega Man Wet:
Link Wet:
Princess Peach Wet:
Use mineral oil and it will keep it darkened and help the engraving to stand out like when itâs wet. Wonât be quite as drastic. May need to re-apply every so often.
You can also spray with polyurethane or acrylic. I donât really like the way that looks personally. Prefer the more natural look.
-S
One reason I didnât use any type of oil, I personally like the natural slate. I just have to admit when wet it does make the contrast better. At the same time, I kinda like the âthe image gets better when usedâ feel of these. So theyâll be staying raw. 
