For blackboard non-porous surfaces only. Always TEST First, making a small mark in a hidden corner of your surface. Then keep pushing down the nib for more than 15 seconds until nib fills with ink.
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White Pen For Blackboard, Bold Tip Liquid Marker
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36 COLOURS DUAL Tip Marker Pens Set Water Based Fine Liner Brush for Kids Adult £9.99 - PicClick UK
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Chalk Lettering: Create a Welcome Wedding Sign using Liquid Chalk Markers, Nathaniel Ong
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8 Colors Neon Water-based Liquid Chalk Marker Pens for Glass
White Liquid Chalk Marker Pen (6 Pack) - Chalkola Art Supply