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Soon after he left the consulate to focus on photography around 1947, Yang became the director of the Northwest Institute of Photography and taught classes in new color methods such as Flexichrome, dye transfer, and Ektacolor, helping influence countless emerging photographers.

UC Davis has typically used dyes to identify individual primates but following the infant deaths “center staff changed procedures so they no longer dye-mark monkeys under six months of age and take other steps to minimize dye transfer”, the spokesman said.

But those who choose to do so should place rug pads beneath these carpets to prevent two common problems – dye transfer, and carpet-surface erosion.

The images are spellbinding: small, exquisite and mostly in color of an unusually subtle kind, due to the complex dye transfer process Porter used.