The pencil skin will crack open if it gets damp to where it absorbs some moisture. Otherwise it works fine on glass flasks and bottles.

Writes well on glass and comes off easy when needed.

I've used just about the whole thing and will be bing another one when its gone.

Easy to use to mark your glass carboys and flasks. Keeps things organized.

I use this when marking my starter flasks. I brew a lot so I often have multiple starters going at one time. This product allows me to keep my starters straight. It washes or wipes off easily and seems to last forever!

I use this to mark up my Erlenmeyer flasks when making starters. When brewing for competition I usually have multiple starters going at once so this handy tool keeps me on track with what goes with what. The only challenge is keeping a good point on it so your marking doesn't messy. I don't have the greatest handwriting so it's probably just me!

sometimes it's the simple things that make the difference. I use this to label my batches with contents dates gravity etc. Comes off easily with a scrub pad but resists water wort etc.

I use this china marker to write dates on bottles and carboys. This may seem like a no-brainer but be sure the surface you are writing on is clean and dry or you will have some issues applying a readable amount of wax. Removing the wax can be tricky but a slightly abrasive pad will take care of it.

Mark your glass not the little white painted area unless you want a little pink area

Nothing fancy here just a handy grease pencil for writing on glass. Especially handy for making a note to yourself if you dropped your stirbar in your carboy.

I just don't mark on the white part of the flask label - mark on the glass and there are no problems

Marks easily and better than a sharpie for this kind of thing. Yes a bit hard to get off but just use an abrasive brush.

I like this but don't want to use chemicals to remove it.