Taylor describes in his paper On the Art of Photogenic Drawing, his method of obtaining "faithful copies of rare etchings of the old masters". A photogenic drawing was taken of an engraving by the usual method of laying it face down on prepared paper and exposing it to bright sunshine. A 'proof' was obtained, which was a reversed image. Once fixed a photogenic drawing was taken of this proof and a positive image obtained, which Taylor called a fac-simile. The two experimental prints show different intensity.