Blackboard Dry Erase Markers, 6 Pack White Chalk Pen, Pens for Windows and Glass, White Liquid Markers Erasable, Chalk Markers with 3mm and 6mm Reversible Tips, Wipeable Pen for Window Drawing

Last Christmas one of my friends used similar pens to draw Christmas pictures on the internal glass doors in her house. I thought it looked good so I’ve been looking for similar pens.This pack of 6 pens produces clear lines although the very thin lines shown on a label in the Amazon product listing may be pushing the fineness of the nib a bit.To get the ink flowing you need to shake the pen and then push the nib down and up a few times. A few turned out to be about twenty times.The nibs are reversible and simply pull out of the end of the pens, but the first pen I tried had the fine nib pointing out. Pumping the pen up and down twenty times to get the ink flowing flattened the end a bit so I’d recommend starting with the broad nib and then reversing it once the ink is flowing.

I'm really loving these liquid chalk pens. Since receiving them I have basically spent the afternoon pretending I am in a crime drama or that I am Will Hunting with my bucket and mop solving impossible maths conjectures. So much fun.On a practical note, these work really well. The ink flows evenly, the colour is vibrant, solid and clear and the reversible tips provide options for writing style. Make sure you read the instructions first, they need to be primed before use. The ink wipes off easily and cleanly with a piece of tissue or a cloth.They are pretty good value at about £1.35 each at time of writing.