3M and I think others make black retro reflecting stickers that turn silvery when reflecting at night. Craft and vinyl cutting machines can turn them into shap

3M and I think others make black retro reflecting stickers that turn silvery when reflecting at night. Craft and vinyl cutting machines can turn them into shapes, numbers, etc. Motorcycle riders will sometimes use them on their helmets or motorcycles which is how I came across this 25 years ago. Motorcycle Black Reflective Tape 3M Scotchlite™ DYI Kit ME RK-99 https://a.co/d/2pNM5Js https://a.co/d/2pNM5Js