![]() UVA rays (320-400 nm) are longer wavelengths that can penetrate the atmosphere and can be further broken up into UVA 1 (340-400 nm) and UVA 2 (320-340 nm) wavelengths. SPF ratings on sunscreens refer mostly to protection against UVB rays. They cause damage to the superficial layers of the skin, resulting in reddening of the skin (sunburns), and DNA damage, which contributes to the development of skin cancers. UVB rays (290-320 nm) are shorter wavelengths that can penetrate the atmosphere. Generally, they do not reach the earth’s surface and thus are not thought to be major contributors to skin damage by the sun. UVC rays (100-290 nm) are the shortest wavelength and are mostly absorbed in the ozone layer. ![]() Within the UV spectrum, there are UVA, UVB, and UVC rays. Ultraviolet radiation is the most damaging to our skin and has wavelengths shorter than visible light, making it invisible to the naked eye. There are many different types of rays in sunlight. Titanium dioxide protects against UVA 2 (320-340 nm) and UVB protection, but does not protect against UVA 1 radiation in the way zinc oxide does. ![]() Zinc oxide provides better UVA protection than titanium dioxide, including protection against UVA 1 (340-400 nm), but it is less efficient than titanium against UVB radiation. Inorganic, or physical sunscreens contain metal oxides such as zinc oxide and titanium dioxide that reflect and scatter UV light. Chemical sunscreens include ingredients such as oxybenzone, avobenzone, octisalate, octocrylene, homosalate, ecamsule, and octinoxate. Organic sunscreens, also known as chemical sunscreens, work by absorbing UV light. Sunscreens help filter out ultraviolet (UV) light using two main types of ingredients. What Are The Benefits Of Iron Oxides in Sunscreen?
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