The cyanotype or blueprint process, a method for making prints using iron salts, was invented by Sir John Herschel in 1842. The process involves mixing solutions of ferric ammonium citrate and potassium ferricyanide. This is then brushed onto paper or fabric and allowed to dry.

The print is made by placing the xray in contact with the sensitized material and exposed to UV light, such as the sun or a skin tanning unit. The material is then developed by washing in running water and dried to reveal an image in Prussian Blue.

Check out these xrays:

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Here is a step by step cyanotype tutorial.

A skull can make an interesting, and asthetically pleasing adition to any fish tank, and can allow your pets to enjoy an interesting and stimulating environment.

Skulls that are designed for this type of environment will be easy to remove and clean, is inert so will not affect the water, and comes in forms specifically made to hide equipment or provide hiding spots.

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