Lot 50055 – Great Britain – 1880 2s Queen Victoria: group of five glass clichés

Great Britain – 1880 2s Queen Victoria: group of five glass clichés of the position “KJ”, four illustrating differing levels of light exposure which have manifested in varying ranges of image quality as well as colour intensity from a faint sepia, silver grey, light brown and brown, one annotated first attempt with 2 minutes exposure, another as the second attempt at 1 minute 30 seconds (“2′” and “1’30”), and a further glass cliché with a stronger impression in a dark brown shade; this group clearly shows the deliberate process Sperati followed in timing the reaction of the chemical products to establish the most desirable outcome; this is the first time such are offered at auction.