Sunprint paper is also called Cyanotype Paper which is a light sensitive coated paper. This light sensitive coating is called Berlin Green. When this chemical is exposed to light and rinsed away it leaves a dark blue color on the paper. This chemical washes away because it is water soluble, which means it dissolves in water. When sunlight hits the sunprint paper it causes a chemical reaction with the Berlin Green which causes the paper to turn into a chemical called Prussian blue. Prussian blue is dark blue and when the paper is rinsed the dark blue does not wash off. Since the dark blue does not rinse off the paper, the area that was shaded by the object allows the Berlin Green to be washed off of the sunprint paper which creates a white image on a dark blue
Sunprint paper is also called Cyanotype Paper which is a light sensitive coated paper. This light sensitive coating is called Berlin Green. When this chemical is exposed to light and rinsed away it leaves a dark blue color on the paper. This chemical washes away because it is water soluble, which means it dissolves in water. When sunlight hits the sunprint paper it causes a chemical reaction with the Berlin Green which causes the paper to turn into a chemical called Prussian blue. Prussian blue is dark blue and when the paper is rinsed the dark blue does not wash off. Since the dark blue does not rinse off the paper, the area that was shaded by the object allows the Berlin Green to be washed off of the sunprint paper which creates a white image on a dark blue