Primary red is 250, the halfway mark between 200 and 300. As the red GamColor filter numbers go up toward 300, they are more orange. As the red numbers go down toward 200 they are more magenta. This organized and logical numbering system makes it easier to locate the desired filter and directs you toward the closest options. Use the convenient GamColor wheel to suggest color combinations.
Polyester is the most durable of the expendable color filter materials.
Polyester and polycarbonate are the two most widely used materials for color filters. They have replaced gelatin and acetate which were used for many years. The new materials have been chosen because they are more durable. Of the two, polyester is the most durable and has been selected as the base film for GamColor filters. The difference between deep dyed and surface dyed GamColor is deep dyed polyester, the color is linked molecularly into the polyester.