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The suns rays

The sun produces three rays: UVC, UVB and UVA    

UVC

This is the shortest wavelength.

It is a sterilizing ray that is carcinogenic and can kill small organisms on contact.

UVC rays presently, do not enter the atmosphere and reach earth.

There are currently no sunscreens that protect against UVC light.

UVB 

Considered the "Burning Ray", it produces sunburn, and penetrates into the epidermis (outer protective layer) of the skin. It is considered to be responsible for inducing skin cancer due to the DNA damage it causes. 

  • It stimulates melanin formation (tan).
  • It is strongest between 10:00 a.m. and 4:00 p.m.
  • It is strongest at high altitudes.
  • It reflects off shiny or white surfaces (water, sand, concrete, etc.) .
  • It is 1,000 times stronger than UVA.
  • Most sunscreens can provide protection.

UVA

Considered the "Aging Ray", it is the longest wavelength and makes up 95% of UV light. It is carcinogenic and the longer wavelength penetrates deep into the epidermis and dermis of the skin.

It has been linked to 67% of malignant melanoma (mole cancer).
  • It turns melanin dark (moles, sun or "age" spots). 
  • It is at full strength from sunrise to sunset.
  • It is strong at any altitude.
  • It penetrates glass (including car windows).
  • It is present 1,000 times more than UVB.
  • The right sunscreen can provide protection.