Seem to do the job. We use them on a blackboard sign and are happy with the results.
Neon Chalk Markers
Was a little skeptical when I ordered these but they are fabulous! They are bright and easy to use. Will definitely purchase more.
GREAT TEACHING TOOL FOR SIGHT IMPAIRED!
I purchased these markers and board for our daughter to use for teaching our sight-impaired grandson, and the markers work beautifully and bright on the black back-board for him to see his letters & numbers. I highly recommend.
Liquid chalk markers
They work great w/ the board I bought. Would definitely do business w/ this company again.