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I'll have to test mine.
Posted by Sally on 10/22/2015, 10:33 am, in reply to "We found they do go bad"
The one I used in the photo I posted had probably been in my tack room for several years. They are certainly cheap enough to replace every few years. In a pinch, white shoe polish will work
Good idea for folks who aren't sure about using the markers to try writing on their horses with them.