From Wikipedia
Berlin green (plural Berlin greens)
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Sun print paper is coated with a light-sensitive emulsion that typically contains a combination of ferric ammonium citrate and potassium ferricyanide. When exposed to sunlight, these chemicals undergo a reaction that leads to the paper changing color and creating the cyanotype print.
Using a piece of paper helps to avoid spillage and ensure accurate transfer of solid chemicals to a test tube. It also minimizes the risk of direct contact with the chemicals, which can be harmful or irritating to the skin. Additionally, it allows for easy clean-up and prevents contamination of the chemicals or the work area.
filter paper
Sun contain hydrogen and helium and low concentrations of other elements..
The human race in general releases many chemicals in the air in the form of pollution. These chemicals have an effect on weather and the warming of the planet. On a more specific level, scientists have released special sun reflecting chemicals into the air in an attempt to keep some of the heat from the sun out.
Black coloured paper will absorb the sun's heat quicker than lighter colours.