Superfrost® Microscope Slide 25 X 75 X 1 mm White Frosted End (556274_GR) 144/GRErie Scientific's Superfrost and Colorfrost slides have a durable, easy to write on, easy to read, brilliant opaque coating. The coating is impervious to virtually all common laboratory chemicals and reagents. A written key indicates instantly which side is up, and the raised coating separates slides to help eliminate sticking, scratching and abrasion. These slides also reduce the need for costly, time consuming paper labeling.