The Fluorescent Yellow labels are an uncoated paper-based material, so there is no additional reflective coating on the labels nor do they glow in the dark. However, the Fluorescent labels can considered easier to see in dim lighting than our other colored materials due to their bright color. You are able to write on these labels with permanent markers, pencils (traditional and mechanical), highlighters, markers, crayons, colored pencils, and pens (ballpoint and felt-tip). Sharpie markers shouldn't bleed through the label, however there is no blockout properties to the Fluorescent labels so text or other imagery could be seen from underneath the label. The labels can be adhered to a variety of surfaces including some fabrics. We recommend for you to try samples and test with your application. https://www.onlinelabels.com/samples