This video shows that how the camera filters are made. They start with jells which are made by jelatine films. They make them with transparent polyster. They mix solvent, dye and flame retarted chemicals. It makes a colored lackers and they test the thickness of lackers. If dropping of lacker is too fast it means lacker is too thin. If the dropping of lacker is too sslowly it means lacker is too thick. If the dropping has steady flow it is consistent. They all go into the coding machine. A thin bar on the roll spreads off the access. They look for the colors that they mismatch or not. Different colors has different advantages. Orange one warm up they light so it is used in indoor lighting. Then they prove that jell doesn’t catch fire. In another station they work on a different color changing. They put the special plastic into hot water and dye. Hot water opens the pores of the plastic and this allows the dye to penetrate into plastic. When it is cooled the color is trapped into plastic. Then make thinner plastic with a mchine and it is ready for cameras. They put gel sheet onto it and then pack it in a plastic bag. The interesting thing about this video was their coloring process.
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