I make wine and rather than going to the trouble of making labels, I used the silver pen straight on the bottle. Wrote the type of wine, year, and VOBA 13 Months on each bottle. VOBA is short for virgin oak barrel aged. I did 5 1/2 cases and there was no sign that the pen was close to empty. It was easy to use, looked good, dried almost immediately, and when I want to reuse the bottles for another wine it should come off a lot easier than scraping labels. I haven't tried all the colors yet, but I don't have any reason to think the others won't write as well. Perhaps some have purchased old stock, or the cap wasn't put on securely, or like one reviewer wrote maybe the pen was stored with the top in a downward position. An excellent product at a very good price and free delivery. Couldn't ask for more.