Vanishes and paints are, for the most part, water-based and will allow ink to pass into the surface below. Consequently, your marker should not be used on such surfaces, unless you don’t want to remove it. Some chalkboards/whiteboards cannot be written on for the same reason, so be sure to test them first.
Some blackboards are wood painted with a water based black paint. Some also have a ‘pitted’ design, which allows water into the board. If using the pens on a blackboard it is highly recommended to test a small area before use.
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