GamColor is deep dyed polyester‹color that is linked into the polyester, not surface coated. Polyester is the most durable of the expendable color filter materials.
Polyester and polycarbonate are the two most widely used materials for expendable color filters today. These materials 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. There is a distinct advantage to this process over surface coated polyester. The deep dye process is more difficult to remove because it disturbs the molecular structure. Once the color is placed into the film it becomes difficult for color to evaporate or depart from the polyester base. In contrast, surface coated polyesters are more susceptible to fading when exposed to heat since the coating is merely placed on the surface and can readily evaporate.
To compete with the more durable deep dyed polyester (GamColor) some manufacturers have chosen to dye in the mass polycarbonate. Polycarbonate is much easier to dye and takes the color more readily than polyester. Using this more susceptible carrier may make it easier to dye, but it also fades easier. Polycarbonates are less durable than polyester under high temperature conditions.
As the chart shows, polyester melts at 480°F and polycarbonate melts at approximately 380°F. Polyester does not soften until it reaches 400°F, whereas polycarbonate softens at about 270°F.
It is not uncommon to see temperatures of 350°F on the color media placed in front of ellipsoidal spotlights and fresnels, much above the softening point of polycarbonate. 'Dyed in the mass' polycarbonates are easier to dye but when heat is applied the dyes become viscus and actually move away from the hot center causing a more rapid fade. Deep dyed polyester (GamColor) resists this fading because the dye does not migrate when the same heat is applied.
Every dye has its own properties and it is difficult to give a specific 'life' for each color. Our tests indicate as much as two to three times the color life for most GamColors when compared to our competitors alternative processes. GamColor deep dyed polyester is the most durable. It is the 'product of choice' if you need long lasting quality.
The specific qualities of GamColor deep dyed polyester are a result of research, organization and quality control. The clarity and fidelity of color from batch to batch is a result of this superior process. We make every effort to insure that the color is the same every time. Quality control is dependent on the finest color measuring devices, but the final judgement is made from visual inspection by experienced colorists.
