Marking glass

[Limpit]

This may be a strange request but does any one know what LFS's use to mark tank glass with? I want to put dates and such on my holding tanks. I want to be able to read it easily and it needs to be cleaned off with something that will not hurt the livestock.

[bjpembo]

a grease pencil is what the ones i've seen use.

[bjpembo]

aka china markers

[dakar]

Those dry erase markers would be another idea, though running a megnetic glass cleaner over it would likely wipe it off.