an air eraser is provided generally in the nature of a slightly enlarged pen . compressed air carries particulate abrasive material from the pen for abrasive removal or erasure of indicia or the like on a base . a trigger controlled air valve is provided upstream of the abrasive material whereby it is impossible for any abrasive material to clog the valve . the flow stream through the air eraser is a straight - through one so that there is no problem of abrasive errosion of corners within the eraser .