They are most frequently made of latex, and can also be made out of synthetic materials including polyurethane.

Different layers of the film emulsion respond differently to lower light levels, and choice of film can be very important.

However, these fibers are usually more difficult to produce as compared to coaxial spinning due to the greater number of variables which must be accounted for in creating the emulsion.

A number of weeds have been proposed as natural alternate sources for latex (rubber), including goldenrod, from which the tires were made on the car famously given by Henry Ford to Thomas Edison.

In the early days of photography, the nature of the invisible change in the silver halide crystals of the film's emulsion coating was unknown, so the image was said to be latent until the film was treated with photographic developer.

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