Plaster

For injuries not serious enough to require a full-size bandage plaster protects the cut from friction, germs, damage, or dirt. Thus, the healing process of the body is less disturbed.

Plaster must be at the same time porous, to the skin to breathe, absorbent, usually having an absorbent pad with antiseptic, and waterproof, not to let out the blood.

Special blue bandages are used by food handlers. These are waterproof, have strong adhesive so they are less likely to fall off, and are usually bright blue in color so that it is obvious to the wearer if it has fallen off into some food.

Sunscreen

Sunscreen is able to absorbs or reflects some of the sun's ultraviolet (UV) radiation on the skin exposed to sunlight and thus helps protect against sunburn. To absorb UV radiation sunscreens contain organic or inorganic particulate governed to about 90% by absorption and 10% by scattering of UV light. In addition, many sunscreens are waterproof, to keep the effect while swimming.
Many sunscreens do not block UVA radiation, which does not cause sunburn but can increase the rate of melanoma. Additionally, sunscreens block UVB, and if used consistently this can cause a deficiency of vitamin D.

@B View advertising of Extreme Waterproof

Radiography

Radiography is the use of X-rays to view a non uniformly composed material such as the human body.

A heterogeneous beam of X-rays is produced by an X-ray generator and is projected toward an object. According to the density and composition of the different areas of the object a proportion of X-rays are absorbed by the object. The X-rays that pass through are then captured behind the object by a detector which gives a 2D representation of all the structures superimposed on each other.

@ More about Radiography