In a typed memo addressed to DCS Ainsley, 'Ron' Cook deliberately deceived Ainsley by informing him that although at that time it was scientifically proven that exposure of the known harmful effects of cynoacrylate fumes has on body fluids, including blood, that he said does not apply in this case, because the blood was taken out of the silencer prior to the date when it was treated by superglue method...
Cook lied...
The key flake was presumably still inside the parker hale silencer on the 15th August 1985, when 'Ron' Cook exposed it to the harmful effects of superglue treatment, since it was not until 12th September 1985, that Fletcher and Hayward removed the flake from inside silencer 'DB/1'...
Either, the blood removed on 12th September, was irrevocably contaminated by exposure to the harmful effects of cynoacrylate fumes, in which case, no blood expert worth their own weight in gold, would entertain trying to group it. On the other hand, if the flake that went on to be analysed was not coated by the harmful fumes, does this then throw up the possibility that the flake cannot have been inside the silencer at the time the silencer was exposed to the harmful cynoacrylate fumes, on the 15th August, 1985, but that the flake had got into it by a process of contamination...
Bear in mind also, that by May 1986, experts were still swabbing the silencers end cap, top washer, and its 17 individual metal baffle plates, and still getting positive blood group activity. How could this still have been possible once the silencer ('SBJ/1') had been previously exposed to superglue treatment on 15th August?
One thing which becomes clear to me, having regard to the aforementioned, is that by September 12th, the need for a replacement uncontaminated parker hale silencer, in which the recovered flake could be allocated into by reference only. This to me seems to be the most likeliest reason for why Ann Eaton handed over the second uncontaminated identical looking parker hale silencer (DRB/1), and adequately explains the key dates when this second silencer came into the fold...