Stickers

RFQ DESCRIPTION:

The requirements of the sticker will be used to determine when it is time to re-apply sunblock SPF lotion. A sheet of self-adhesive photographic paper (standard B&W photo print paper) is printed with circles of different greys, with a white or pale shape left blank in the middle. The discs are about an inch across or less. When exposed to light, the paper goes grey slowly on its own (it doesn't need any developer) as the silver bromide or halide crystals develop metallic silver atoms within them. The darkness of the printed grey can be varied according to the SPF required (lower SPF's would have a lighter grey print). The stickers go through three stages of exposure. First, when the sticker is removed from the lightproof case, it shows a pale or white shape on a darker grey background. As the shape darkens, it finally becomes the same color as its background (effectively it disappears) this is the time when you re-apply the sunblock. Each SPF factor has it's own special sticker, so you cannot use one with another make of SPF. We would also like to apply a waterproof varnish over each sticker as well.