- Janlaugh 5 Pack Alcohol Resistant Laboratory Markers, Black Dual Head Permanent Freezer Pens with 0.5mm Fine Point and 1.0mm Makers Tip, Designed for Industrial, Lab and Hospital Use

Writes on glass, plastic etc no smearing and won’t come off. Really like the dual tips.

Writes clearly on all common laboratory consumables (tubes, flasks, plates, dishes). Having a fine and extra fine tip on the same marker is incredibly useful. I've tested extensively and can confirm they are completely resistant to 70% ethanol and bleach.

Great marker. Dries fast and durable. Will wash off in outside settings during rain. For inside projects they work great. Good value for the money.

It is ethanol resistant from all the 70% Etoh in our lab and is good on multiple surfaces. the best I've ever tested.

ONLY RESISTANT TO IPA. Comes right off with 70% ethanol or methanol as well as acetone/ethanol. Not good for gram stains or wright stains. Other than that, very juicy markers. They write wonderfully but will spread/bleed on frosted slides.

They are resistance to water and TE buffer, but I found that this marker are not much resistance to ethanol alcohal.

we searched high and low for good alcohol-resistant markers for lab research and we tried these and love them! we wrote on a tube and tried to remove with alcohol wipe and it stayed on. Glad we tried them.

Good pens/markers. They haven't rubbed off from anything I've written on with it.

super

These markers are great for lab use especially on small tubes and the ink doesn't come off if you spray with IPA, just avoid rubbing it right after writing