I constantly have issues with these markers writing too lightly, even when they are brand new. I try to do what is suggested on your site and other sites to increase the effectiveness of the markers, but nothing seems to work. About one in five of these markers works well out of the box and I don't know what else to do to get the nice, even, dark colors that I once got from the more toxic dry-erase markers that once were prevalent.
For several years the custodial department of our university has researched the best dry erase marker for the classroom setting that pleases the faculty, the custodians, and hopefully the budget. That said, Quartet brand markers are the best. 1. They erase cleanly through out the day. Faculty can easily erase with out a "ghosting" shadow of the previous writing. 2. Color dry erase markers clean easily once each day on whiteboard painted walls. Other less expensive color dry erase markers had to be erased immediately after use. Otherwise nightly custodial cleaning could not remove the color residue "ghosting" even with whiteboard chemical cleaner. 3. Quartet dry erase markers make a full strike mark and have good ink density. Other markers we tried would not make a full ink mark. It looked like only half the tip was making contact with the board. Or the tip was 'dry' from lying horizontal on the tray, needing to be held vertical for a moment to saturate the tip with ink.
There's nothing I detest more than a dry erase marker that loses its ink flow at inopportune times. These markers are fresh. Vibrant. Long lasting. Everything I could ask for in a dry erase marker.
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