JanlaughAlcohol 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 (5 Pack)

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

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.

This product didn't work for me like I hoped. I had to rewrite things over and over to get the ink to keep going

Update: These are the best laboratory markers we have found, so far. Still not like the older permanent Sharpies, but decent.Can't seem to find alcohol resistant laboratory markers anymore. Sharpie quit making fine point chemical resistant markers and I thought these would be the answer...nope.

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.

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

I was disappointed how much they smudged when writing on paper. Needed to wait a few minutes to dry and I wasn't crazy about having to do that. I would not recommend.