This from the COA -
80.
Having seen what they believed to be red paint on the moderator, members of the deceased's family returned to the farmhouse and examined the red painted mantel shelf above the Aga in the kitchen. On the underside they found what appeared to be recent damage.
On 14 August 1985 the underside of the mantel shelf was examined by one of the scenes of crime officers, DI Cook. He found score marks and took a sample of the paint from the area. The paint sample was compared with the paint recovered from the knurled end of the moderator and each was found to contain the same fifteen layers of paint and varnish.
On 1 October 1985 casts were taken of the marks and impressions found on the underside of the shelf. These were also consistent with having been caused by the moderator and there had been more than one contact between it and the shelf.