The labels took a little to figure out. I used excel to make the labels and I set the fill to black and the font to white. Then I printed them on Astrobright 65 lb cardstock (just go to Walmart or some other place and find cardstock that fluouresces). This way the lettering does fluoresce so you can read it even when the UV is on. I then put that onto another 130 lb card stock using rubber cement. This make them very stiff and less likely to warp. I spray paint the back with chalkboard black paint (very thin / light coats) so the backs do not fluoresce. Cut them out and use a sharpie to blacken the edges.Â