Ultraviolet light. If you don't have one, you could use the Sun. I used one of these UV LED lights. Ultraviolet sensitive beads. These are little plastic beads that change color when exposed to UV The sample compartment provides a light-tight environment that limits stray radiation. Samples normally are in a liquid or solution state, and are placed in cells constructed with UV/Vis transparent materials, such as quartz, glass, and plastic (Figure 10.3.6 ). The light-coloured and glossy boxes you have in your photos are the safer ones, these will reflect most of the light. The black and matt finish cardboard boxes will just absorb the light (including UV) and get both the box and it's contents hot. Plastic DVD's and CD's warp in the heat and this will be a bigger problem than anything else. Can Uv Light Penetrate Glass Or Plastic? Material transparency to UVC. According to a Stanford University study, short wave UV (UVC) cannot penetrate most plastics and ordinary glass. Acrylic plastics, in general, do not allow UV-C wavelengths (100-280nm) to penetrate. Also, very thin acrylic sheets of less than 5 millimeters will not absorb
The way they do that is with electrons. Chemicals all have electrons inside them, and these electrons (depending on which chemical they’re in) can absorb different types of energy – heat, light, UV – and turn it into other forms of energy. So you can imagine that the sunscreen molecule is sitting on your skin.
The heating process in plastics processing is much quicker for darker materials. The reason behind this is that black plastic absorbs infrared radiation better than white or transparent materials. In experiments with black and transparent plastics surprising time differences were detected when joining two plastic shells together. In this class of plastics, by far the most widely used plastic is PMMA or Poly Methyl Methacrylate. It is also known as plexiglass or acrylic glass. PMMA has a refractive index of 1.49 at 589.3 nm and a 3 mm thick sheet transmits 92% of light in the visible spectrum. PMMA absorbs UV light with wavelengths shorter than 400 nm, and IR wavelengths
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    • does plastic absorb uv light