Let’s dive back a little bit..shall we?
Cyanotype printing, which was unveiled in 1842 by Sir John Herschel, a polymath with expertise in chemistry, experimental photography, mathematics, and astronomy, was achieved by blending Ferric Ammonium Citrate and Potassium Ferricyanide. This discovery marked a significant milestone because the mixture is responsive to Ultraviolet Light, commonly referred to as sunlight.
This technique is recognized as an alternative photographic printing process and is often called sun-printing. Nevertheless, it remains relatively unfamiliar, particularly in Singapore.