Re: Some Kallitype observations
Rajul,
Thanks very much for this data. Very interesting for me as
I am still in the research stage of Kallitype,
Regards,
David
H
On Nov 21 2006, Venkatram Iyer wrote:
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
AP or STHG-B:
- do not need an oxalic
acid pre-coat
- one thin coat works well; Dry it, equilibrate paper to
room
conditions, then expose.
Emulsion:
- 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.
Developer:
-
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.
Rajul