Film Data Sheet
T-85
Black & White Pack Film
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85
Film Speed
ISO 80/DIN 20
Format
1
3
/4 x 33/8 in. (8.3 x 8.6 cm)
Pack Film
Image Area
3
2
/4 x 27/8
Finish
Glossy
Exposures per Unit
10 exposures per pack
Development Time
30 seconds at 65°F (18°C) and above
in. (6.9 x 7.2 cm)
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Description
Medium-speed, medium-contrast, fine-grain film which produces
high quality black and white prints and negatives suitable for
enlarging.
Key Applications
• Old time photography
• Portraits
• Professional photography proofing
Compatible Hardware
• Cameras or instruments with CB-1034 or CB-80 camera backs
• MiniPortrait Camera models M484, M485b, M486V , and M488V
• ProPack Camera
Special Treatment
Requires print coating the positive and clearing the negative to
prevent fading and discoloration. T o clear the negative for reuse,
immerse it in a sodium sulfite clearing bath within 3 minutes after
development. Sodium sulfite powder is readily available from
professional photographic supply dealers and chemical supply
houses.
Mix in the following proportions:
Warm water: 2 liter or 70 fl. oz.
Sodium sulfite powder:440 grams or 16 oz. (weight)
(anhydrous/desiccated)
Slowly add the powder to the water; stir continuously until all
powder is dissolved. Allow to cool to approximately 700F(210C)
before using. Store the solution in brown, well-stoppered
bottles or in a tank with a floating lid.
T o prevent scratches:
Negative scratch resistance can be improved by treating the
processed negative (after clearing in water and sodium sulfite) in
a solution of Kodak Rapid Fix with Hardener (parts A & B) for
two minutes. This solution should be made up and used in
accordance with Kodak’s recommended mix procedures,
chemical caution statements, wash times and temperatures.
Caution
This film uses a small amount of caustic paste. If any paste appears, avoid contact with skin, eyes and mouth
and keep away from children and animals. If you get some paste on your skin, wipe it off immediately, then
wash with water to avoid an alkali burn. If eye contact occurs, quickly wash the area with plenty of water and
see a doctor. Keep discarded materials away from children, animals, clothing and furniture.
Limited Warranty
See information on the film box.
“Polaroid” and “ProPack” are trademarks of Polaroid Corporation, Waltham, MA 02451 USA.
All other product names may be the property of their respective owners.
Film Data Sheet
Technical Data
T-85, T-665 (positive/negative)
Instant B&W Peel-Apart Pack Film
The information below represents the typical performance of Polaroid’s T-85 and T-665 black and white peel-apart film.
Specific film lots may vary.
o
Recommended
speed (ISO)
Recommended
processing time
and
temperature
Resolution
(1000:1)
Contrast
Spectral
sensitivity
80 / 20
30 sec. at
o
F/21oC
70
13 - 16 line
pairs/mm (print)
160 - 180 line
pairs/mm
(negative)
Medium
Panchromatic
Characteristic H&D curve for normal,
hot and cold development
3
o
o
55
F/13
C
o
70
F/21oC
o
F/35oC
95
2
Processing time and temperature
For best results process at temperatures
above 60oF(16oC).
o
F
85+ 29+ 30
75 24 30
70 21 30
65 18 30
60 15 40
50 10 60
o
C
Tim e in
seconds
Filter factors
Filter no. 6 8 15 25 47 58
Light source at
o
3200
K - Tungsten
Light source at
o
5500
K - Daylight
Aperture
adjustment
(f-stops)
Filter factor
(exposure
multiplier)
Aperture
adjustment
(f-stops)
Filter factor
(exposure
multiplier)
Pos.
Sample Density
1
0
At 70oF/21oC: D-Max = 1.90(P) D-Min = .10(P) Slope = 1.40(P)
1.42(N) .23(N) .70(N)
1/2 2/3 1 2 1/2 3 2/3 3
1.4 1.6 2 5.6 12.6 8
1 1 1 1/3 3 1/2 3 3
2 2.5 2.8 11.2 8 8
Neg.
-2 -1-3 -0
Relative Log Exposure
D-Max:
The density value for the film’s darkest
black.
D-Min:
The lowest density value that a film
exhibits. In prints, the whiteness of the brightest
highlight, relative to the unprocessed print.
Slope:
The positive ratio of the log E increments
of the straight line region of the curve, as
determined by the 1/4-3/4 increment method.
The slope of an H&D curve indicates the overall
contrast of a film: low contrast slopes less than
1.10; medium contrast slopes from 1.10 to 1.70;
high contrast slopes greater than 1.70.
Film Data Sheet
Technical Data
T-85 (positive/negative)
Instant B&W Peel-Apart Pack Film
Reciprocity law failure
A wide range of shutter speeds can be used without loss of film speed.
For longer exposure times, some exposure compensation is suggested.
Filter Factors
Reciprocity Law Failure
0.5
0.0
-0.5
-1.0
-1.5
-2.0
-2.5
Spped Change (f-stops)
-3.0
-3.5
.001" .01" .1" 1" 10" 100"
Exposure Time (seconds)
Spectral Sensitivity
1000
100
10
Spectral Sensitivity
1
Modulation Transfer Function
100
80
60
40
% Modulation
20
0
134
Spatial Frequency (cycles/mm)
Processing the reusable negative
In order to remove the reagent layer and the anti-halation
dyes, the processed negative needs to be washed in an
18% sodium sulfite solution. The salts within the solution
minimize swelling in the negative’s gelatin layer that would
be caused by washing in water only. Swelling can cause
reticulation which would remain after the negative dries.
To prevent scratches:
Negative scratch resistance can be improved by treating
the processed negative (after clearing in water and
sodium sulfite) in a solution of Kodak Rapid Fix with
Hardener (parts A & B) for two minutes. This solution
should be made up and used in accordance with Kodak’s
recommended mix procedures, chemical caution
statements, wash times and temperatures.
2
0
350 450 550 650 750
Wavelength (nm)
Reciprocity:
The ability of the film to respond in a constant manner
to a constant exposure (light intensity x time). Reciprocity failure
occurs during very long or very short exposures, requiring the
photographer to increase exposure.
Spectral Sensitivity:
Shows the equivalent energy needed at each
wavelength in order to activate the emulsion so that it produces a
neutral density of .75.
Ingredients
Warm Water
Sodium sulfite
(anhydrous)
Metric
2.0 liters
440 grams
U.S.
70 fl. oz.
16 oz. (avdp)
Type 85
Polaroid Positive/Negative
Black & White Instant Pack Film
First prepare the negative-clearing solution
Do this before the film is exposed and developed. Immediately after
development (within 3 minutes) the negative must be immersed in
an 18% sodium sulfite clearing bath.
Preparation of the 18% sodium sulfite solution
Sodium sulfite powder is readily available from professional
photographic supply dealers and chemical supply houses.
Mix in the following proportion:
- Warm water 2 liters 70 oz. (fluid)
- Sodium sulfite powder 440 grams 16 oz. (avdp.)
(anhydrous/desiccated)
Slowly add the powder to the water; stir continuously until all
powder is dissolved. Allow the solution to cool to approx. 70°F
(21°C) before using. Store the solution in brown, well-stoppered
bottles or in a tank with a floating lid.
Loading, exposing and processing film
See instructions supplied with your camera or film holder for
detailed information.
Important:
negative, separating the negative and preparing it for printing
should be done in dim light. If that is not possible, extend the
development time. (Such extended development will improve the
minimum density areas of the negative and assist in negative
clearing, but may reduce the quality of the accompaning Polaroid print.)
For best results in the minimum density areas of the
Separating the negative and print:
At the end of the full recommended development time, peel the print
away from the negative using a swift unhesitating motion. Be careful
not to touch or scratch the image surface of the negative or the print.
Coat the print immediately (see Coating and care of prints.)
Temperature is important
Pictures may be exposed at any temperature, but the temperature of
the film during development is important. Below 65°F (18°C),
develop longer, as shown in the chart. At the lower temperatures,
the speed of the negative will be reduced. Thus, a correctly exposed
positive may be accompanied by a negative that is too thin. To get
the best possible negative at these temperatures, give more
exposure, so that you get a positive that is somewhat lighter than
normal. Development below 50°F (10°C) is not recommended.
Temperature Processing time
65°F+ 18°C+ 30 sec.
60°F 15°C 40 sec.
50°F 10°C 60 sec.
Preparation of the negative for printing
Important: To avoid film damage, all solutions and wash water
should be nearly the same temperature, ideally 65–75°F (18–24°C),
when in use.
Clear negative: Immerse negative in sulfite solution and agitate
gently for 30–60 seconds or longer, if desired. The solution can be
used in trays (with emulsion side up), or in deep film tanks. Put each
negative through individually or use clip-type film hangers such as
the Kodak #6 hanger. Insert each negative carefully and keep the
negatives from touching each other. Remove tabs and back coat
material. Negative must be cleared of residual developer layer and
opaque backcoat. Negative may remain in solution up to 72 hours.
Note:
Do not use conventional fixer as a substitute for sodium sulfite
as it will not remove the opacity layer from the negative. For
information on treatment of the negative in the field, contact the
Polaroid office nearest you.
Temporary storage in water:
sodium sulfite, you can safely store developed negatives in water
(about 70°F/21°C) for a short time. While negatives are in water,
handle them carefully and do not attempt to rub off the developer
layer. As soon as you can do so, treat the negatives in a sodium
sulfite bath in the normal way.
Wash negative:
30 seconds will do; rewash later for permanence. Avoid scratching
the negatives, by keeping them away from each other and from the
sides of the container. Excessive washing may weaken the emulsion.
Wash for 5 minutes in running water. For urgent use,
Dip negative in wetting agent:
agent (such as Kodak Photo-Flo diluted at least 1:600). Follow
manufacturer’s instructions for use.
Dry negative:
hangers, clothespins, etc. Do not dry with excessive heat. Avoid
dusty areas.
Hang up with commercially available film clips,
Printing and retouching:
necessary, and enlarged by conventional techniques.
Coating and care of prints
Prints must be coated immediately after development to protect
them against scratching and fading. Use the print coater packed in
the plastic tube. Keep freshly coated prints separate from each other
until they are thoroughly dry. Keep the coater fluid away from skin,
clothing, furniture.
If you do not have immediate access to
To avoid drying marks, use a wetting
When dry, the negative can be retouched, if
Type 85
Polaroid Positive/Negative
Black & White Instant Pack Film
1
Peel print off in a swift,
continuous motion.
4
Agitate negative gently in
sulfite 30-60 sec., or store
in solution.
2
Holding negative top tab,
tear off leader just below
pod (a) and discard.
5
Remove from sulfite, pull
off top tab and black backcoat (b); inspect negative.
3
Holding negative by top
tab, remove paper mask
from negative and discard.
6
Pull off bottom tab (c);
store negative in sulfite or
go to finishing process.
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