Leucotype . The Leucotype process was Talbots attempt at producing a single direct positive print , in answer to the Daguerreotype .In the event it was eclipsed by the Calotype from which of course you could produce many prints. Talbots notes of 20th April 1841 and 3 April 1843 give the general idea and his thought process but lack detail . Here I have used the method outlined in 1843 Talbots notes are , as usual sketchy to say the least , Sir David Brewsters notes of the same year are better but still lack detail. This is my first attempt at this rare process and it works ! I just need to fine tune it .
Robert Binghams process Calotype as detailed in The Calotype process in 1847. Except I forgot to dilute the sensitizer as directed . This is full strength but without the gallic acid. The paper is Ruscombe Timothy 2 and the exposure was 30 seconds in bright sunshine.Using my Negretti and Zambra Petzval lens from the early 1860s. The image was developed using gallic acid alone and came up very fast indeed.
Inverted scan from the calotype.
Robert Binghams process Calotype as detailed in The calotype process in 1847. Diluted 1 part sensitizer to 20 distilled water as directed . The paper is Ruscombe Timothy 2 and the exposure was 30 seconds in bright sunshine.Using my Negretti and Zambra Petzval lens from the early 1860s. The image was developed using gallic acid alone at first and then adding some of the sensitizer after 10 minutes. 16 minutes in all.
Inverted scan from the Calotype.
Photogenic drawing . On Canson marker . 2 hours 20 mins hour exposure with my Negretti and Zambra lens. The sensitiser was Talbots ."Fixed" in Bromide.
Salt print from the Blue Apollo . The back of the negative is heavily stained and this printed very very slowly 4 hours 15 minutes. . The sensitizer was John Adamsons Ammonio Nitrate of silver which is usually very fast. Fixed in Potassium Iodide.
Photogenic drawing negative. Talbots sensitizer On Canson Marker. Made using my sliding box camera and my 1860s Negretti and Zambra Petzval lens. 2 hours exposure in Bright sunshine.
Salt print from the photogenic drawing negative.1 hour with lots of bright sunshine. On Canson XL using John Adamsons Ammonio Nitrate of silver.
Photogenic drawing on Canson XL using John Adamsons Ammonio nitrate of Silver sensitiser. Sliding box camera , Negretti and Zambra Petzval lens. 3 1/4 hours in a mixture of weather from bright sunshine to fog !
Inverted scan from the photogenic drawing.