Can I use special slides like Superfrost Plus and capillary gap slides? FAQ Report Yes. However, we recommend to do a test printing first. Some special coatings can have a negative effect on the ink resistance, the resolution and also on the slide movement on the ramp. For instance, printing barcode on Superfrost Plus slides has proven to be difficult. We propose to reduce the printing resolution to 180 dpi, if possible. For alphanumeric prints we recommend the use of narrow fonts, like Courier.