Some years ago, I was engaged as an expert witness by a law firm in Aberdeen, WA. The problem they were dealing with was mildew attack on the wooden homes throughout the area. They had gathered many experts, including Bill Fiest from USDA Forest Products Lab and a New York City biologist. This was a huge case, with many lawyers and all the experts spending several days visiting the homes with varying degrees of mildew attack.
As part of the discovery process, the paint company formulation was subpoenaed, and the lead lawyer had me spend a day teaching him what all the components were - based on the batch card we had received. The crucial point to my mind was the dosage of the mildewcide. I had also arranged to get individual component documentation from all the suppliers. In that, the mildewcide supplier had a minimum dosage recommendation, and the coating manufacturer had used the minimum recommended.