Samsung ML--6100 - Manual (Page 46)

3. 7 Print Media Information
• For transparencies:
Hold the transparencies by the edges and avoid touching the print
side.
Fan the stack of transparencies to prevent feeding failures. Be careful
not to scratch or leave fingerprints on the print side.
4. Notice the print materials stack height limit mark on the inner
side of the paper guide. Use it as a guide for stack height when
loading print materials.