Cancer Diagnostics MP1000 Moist Mark Plus™ Slide/Cassette Markers - PK/10

When working in a scientific laboratory, these Cancer Diagnostics markers became my favorite among all others that I tried because they lasted a long time even with much use, didn't dry up and become useless nearly as quickly as other markers, the fine point is excellent for smooth clear writing, and the ink is actually permanent and didn't rub off or dissolved away with water and ordinary solvents like alcohol, as many other "permanent" markers do. So I was very happy to find that they are available to the general public on Amazon and now have a supply for home use on a variety of surfaces. The ink even adheres to and writes smoothly on glossy surfaces (like some jar labels) where some other markers do not.