CAMBRIDGE - A UK-based start-up says it has found a novel method of harnessing protein DNA to produce microorganisms which can deposit and fix dyes to fabrics. Using synthetically grown organisms that effectively concentrate and readily absorb nutrients, salts and other elements, the company claims once scalability has been achieved its new technology can make the deposition and fixation of dyes more efficient and eliminate the use of metal salts and heavy metals to raise or lower pH levels.