Winsor and Newton has been making paint for artists for the past 180 years. Each color is made to have stable color. The company makes sure that the quality control process keeps the paint ready to be what artists need and want.
The carmine of Winsor and Newton is a permanent one that is a rich red that has a bluish undertone. The process today is unlike to original, which required the use of the Mexican cochineal beetle. That paint faded over time. This formulation maintains its color and provides color that artists seek.
Carmine is the color of the distinctive red coats of the British Army. The permanent version was made possible in the 1990's with the discovery of the correct process with Quinacridone pigments makes it the closest to original carmine than any other option. The color also has the right transparency to be used as a glaze.