Separations: start here

notations on making separation negatives. bits from the past intended for today.

DSChromeCN
R252970
G586199
B4747b98
wratten filter numbers

direct seps are easiest, but you create “time seps” as well — trichromie.

contact seps are easier than enlarged seps. 
learn what standard light is -- then you can begin to translate "old" literature. Use the theory and experience of those who made their living in labs.

contact: standard light
 standard light - tungsten -
first, early innovator lab: Evans & Peterson Color 
K&M filtermatic and K&M Point Light … Omega ULE system
3 FC = .3 density from a 3.0 wedge density
AIM ~= .4 shadow negative

using silver density steps will introduce you to the “green problem” — aka, green gaps
calibrate with color strips &&& silver wedges

derive “Relative Exposures” of the sep set
29, 61, 47b

notes from tabula rosa: super XX to Tmax. XX is twice over. convert those historical refs to current start points. Oh. use HC-110 B at 72F
—
visual evaluation/ no densitometer, make a BW print onto known paper.
print the Green Sep, unless GREEN is the dominant scene color. (then use red)

—
First seps from: DuPont Fine Grain Pan (20x) easy

Grain of seps: 1975-80)
Plus-X -- lowest, best enlargement
Sep Type 1 (reciprocity notes)
XX - highest grain
         -Green: less exposure longer Development
—
DS Base exposure: (working with ‘factors’)
(25) Red ~=~ 1
(58) Green +1/3
(47) Blue + 2 2/3
OR take blue as the base exposure, then apply ND filters to the RED & GREEN exposures.

— newton ring 
offset powder // gum glass
watch RH of film room.
don't mix exposure, storage, processing stages in same room.
—
tmax contact [at asa 6]
29	24 sec
61	14 sec
47b	135 sec

—
HC 110 A,B  // C,F
DK50  st, 1+1 // 1+2, 1+3
D76	st, 1+1 // 1+3
Seps // masks
from back in the day:
Dupont 16D  6,7,8,9  == for gammas of .6 to .9 /.Sure made it easy.
--
watch how you dry the seps. angles matter. never force dry (use "secret" dryer)
learn how to mix D76 so it doesn't "shift" on you. Oh, avoid those who don't know how.

########

two shoes

  • the path is the destination
  • the destination isn’t on any path
  • MA (japanese)

###

PS. what do I currently use? Ilford: delta, ortho plus, fp4+ — not Kodak. I have it. Have used it. don’t now.

Color Separation

— anxiety over the new network of knowledge. Talking before experience: if it sounds right; you heard it from someone who talks a lot, sounding complex, it must be sound.

[ he got the last bit correct ]

Ilford Ortho+ has excellent darkroom properties: easy to manipulate, wide range of linear response (it is what is used to make standard step wedges), AND it makes seps for TWO of the THREE colors. Only RED is missing.

Lesson: as always, look wider, avoid gossip groups.

Extra: the first color photograph was shown before panchromatic, or ortho film was invented.

[getting to separation negatives. more than one way to climb mount Fuji]