U of S | Mailing List Archive | alt-photo-process-l | Some Kallitype observations

Some Kallitype observations

Hello All,

I would like to share some recent observations using the Kallitype procedure.

Papers: Stonehenge B side (STHG-B) prints better than the other side. Sidedness was
determined by sxs comparison of marked sides.
Arches Platine (AP 310 gsm) needs less expo than STHG-B, & yields richer, more lustrous tones than STHG-B
Graphix Vellum48 shows greater detail than AP
Gelatin-sized, formaldehyde-hardened AP and STHG-B produce sharper prints with
cleaner highlights than unsized controls.
Unsized paper produces delicate softer prints with subtler colors.

Graphix Vellum 48:
- pre-coat with oxalic acid
- use 2 coats of emulsion
- exposure will not produce a visible image. So pre-establish exposure w steptab
- Pd toner >> cool browns; Au toner >> cool B/W

- do not need an oxalic acid pre-coat
- one thin coat works well; Dry it, equilibrate paper to room conditions, then expose.

- a 6:4 AgNO3:FO mix works better IME than the 5:5
- additives (Au, Pd or Pt) block up shads; this may be corrected by decreasing exposure
- Steptab prints indicate that tonal separations are cleaner when additives are omitted.

Exposure: Optimum exposure is reached when shadows print a medium-dark ochre.

- 4% KOX develops the print slowly to a cool brown after 5' of development. There was
no observable bronzing.
- With increasing concentration ( 5, 10 and 20% KOX), development is rapid and proceeds to B/W, bronzing occurs in shadows, and prints are muddier.

Toner effects depend on:
- the presence of additive in the emulsion
- sizing of paper
- possibly local factors (water composition, temperature, humidity, etc)
- selenium toning (cheap toner!) of sized AP coated with the 6:4 mix printed in cool browns, and showed good detail across tonal range.

I have found Sandy King's and Carmen Lizardo's Kallitype publications very helpful.

Please feel free to comment/confirm/complement the above.