Kallitype

a chemical process similar to the Van Dyke Brown based on the use of a combination of ferric and silver salts. Three developing solutions used to give a different image color. Kallitype images generally have a richer tonal range than the cyanotype. These prints were popular in the 19th century, and then their popularity faded away.

Darkroom Technique

chemical solutions required

sensitizer:

Ferric oxalate (50g)

Oxalic acid (3g)

Silver Nitrate (25g)

add distilled water to make 300 mL

Developers:

Sepia tones-rochelle salt (45g), potassium dichromate (1.5g), add distilled water to make 950 mL

Blue-black tones-Borax (24g), Rochelle Salt (90g), Potassium dichromate (1.5g), add distilled water to make 950 mL

Neutral-black tones-Borax (90g), Rochelle salt (68g), Potassium dichromate (1.2g)

add distilled water to make 950 ml

Fixer:

sodium thiosulfate(hypo) (50g), Ammonia (.88) (12mL)

add distilled water to make 1 liter

Procedure

step 1: spray paper with household starch, allow paper to dry

step 2: prepare sensitizer solution

step 3: apply sensistizer using cross-hatched strokes, dry paper in darkness

step 4: expose image until tone look correct

step 5: place paper in developer, do not overdevelop

step 6: wash for 2 minutes, then fix in special fixer, then treat in hypo solution, allow to dry