[printed address:]
Laboratory, Bank Plain,
Norwich
Nov 17 /58

To H. Fox Talbot Esq^re

Sir,

We trust you will not think us troublesome if we ask you a question relating to the engraving process patented by you and some prints from which were published in the Photo News last week –

We have been trying some plates for amusement but can only partially succeed This day, we exposed one of Ferrier’s transparent positives upon the carefully prepared copper plate for 2½ hours the actinic power being slow, about one half hour was bright sunshine – the picture was slightly visible when taken out of the frame – it was then dusted over with fine resin smelted (not being able previously to get a nice coating of copal upon a plate we tried) and the various solutions as recommended in the specification applied – we obtained here & there black spots etched into the plate but only a very faint etching of the picture, so faint as to be scarcely perceptible Will you be good enough to inform us whether the fault was owing to insufficient exposure, or to anything wrong about the coat of resin –

We feel sure the solutions No 1. 2. 3 were right enough as they were prepared very carefully – and were successively tried for nearly an hour

We are Sir Yours most resp^y,
Harper & Sutton

[envelope:]
H. Fox Talbot Esq^r
Laycock Abbey
Wiltshire