Visible dye penetrant is used to find cracks and other surface flaws in metals, ceramics, glass and plastics. The dye can be applied and then viewed under either visible light or black light depending on the specific penetrant. Berg offers visible dye penetrant from Magnaflux, Sherwin and Chemetall. Please browse our products to find the right one for you. If you have any questions, please give us a call at 1-847-577-3980 or send an email to info@bergeng.com. Our experienced staff is there to help.