I bought these because ultra fine sharpies don't show up on dark glass that I cut for mosaics and the regular silver and gold only comes with fat tips, so I thought I'd try this. Horrible on glass! Smears everywhere and comes out in blobs and has to be stored on their sides.  So now I'm still stuck trying to squint and see my lines on dark colored glass sheets. UGH. Sharpie please create an ultra fine/fine silver or gold or white!!!