These were the first commercially available color prints created by the chromogenic dye coupler method. Detection by chemiluminescent substrates has several advantages over chromogenic substrates. Additionally GBS colonies can be tentatively identified after their appearance in chromogenic agar media. There are three basic methodologies&colon; gel-clot, turbidimetric, and chromogenic. One solution to this problem is to measure the chromogenic factor X level. Chromogenic materials use dye couplers to form colour images. Besides its natural substrate MHET the chromogenic substrate MpNPT, Mono-p-nitrophenyl-terephthalate, is also hydrolyzed well. The photograph is a chromogenic color print or c-print. Older chromogenic papers undergo more rapid fading compared to modern materials. The term "LightJet" is often used to generically describe a digitally made chromogenic print. Sunlight has a chromogenic effect on the mycelium, with intense coloration. Sunlight has a chromogenic effect on the mycelium with intense coloration. Chromogenic prints, like most color photographic prints, are developed using the RA-4 process.