Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Forensic Photography > 8 > Flashcards

8 Flashcards

1
Q

— refers to the PRINCIPLE IN PHOTOGRAPHY that explains how the latent image in the exposed film is converted into a negative image (visible image).

A

FILM DEVELOPMENT

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Stages of Film Development: (PDSFW)

A
  1. PRE DEVELOPMENT WATER RINSE
  2. DEVELOPING
  3. STOP BATH - RINSE BATH
    4.FIXING BATH OR FIXING
  4. WASHING
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

This is done by simply SOAKING THE FILM IN WATER FOR 2 TO 3 MINUTES while agitating the water container for every 20 seconds.

A

PRE DEVELOPMENT WATER RINSE

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Converting the EXPOSED IMAGE ON THE FILM INTO AN ACTUAL IMAGE. Exposed film affects the silver halides, but the change is invisible. It ENABLES THE INVISIBLE IMAGES TO FORM. This is performed by SOAKING THE FILM IN THE DEVELOPER.

A

DEVELOPING

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

The REMOVAL OF THE TRACES of the developer as well as it helps in the REMOVAL OF EXCESS OR UNDEVELOPED SILVER HALIDES. This process stops development by NEUTRALIZING THE EFFECTS OF THE DEVELOPER.

A

STOP BATH OR RINSE BATH

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

It is required to loosen the silver halides from the unexposed halides so they can be washed away. This stage also REMOVES THE UNEXPOSED AND UNDEVELOPED HALIDES by converting them to SOLUBLE SALTS which may be washed from the emulsion. It also MAKES THE IMAGE PERMANENT IN WHITE LIGHT.

A

FIXING BATH OR FIXING

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

This is the FINAL PART OF THE PROCESSING CYCLE, which REMOVES THE RESIDUAL CHEMICALS SOLUBLE SILVER COMPOUNDS from the emulsion and reveals the image.

A

WASHING

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Chemical Contents of Developing: (RARP)

A
  • REDUCER: METOL, HYDROQUINONE
  • ACCELERATOR: BORAX, SODIUM CARBONATE, SODIUM HYDROXIDE
  • RESTRAINER: POTASSIUM BROMIDE
  • PRESERVATIVE: SODIUM SULFITE, SODIUM BISULFATE
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

The Three Forms Of Rinse Bath Are:

A
  • WATER RINSE BATH
  • ACID RINSE BATH
  • HARDENING RINSE BATH
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Ingredients of Fixing Bath:

A
  • FIXER: hypo (sodium thiosulfate)
  • NEUTRALIZER: acid (acetic acid)
  • PRESERVATIVE: sodium sulfite
  • HARDENER: potassium alum
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

The MOST IMPORTANT CHEMICAL IN ANY DEVELOPING AGENT. It is the one that REDUCES THE EXPOSED HALIDES into visible metallic silver. The two chemicals mostly used are: (1) __________ and (2) _________

A

REDUCING AGENT
- HYDROQUINONE
- METOL

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

energize the reducing agents and THEY SOFTEN AND SWELL THE EMULSION to permit the developer to penetrate deeply and quickly.

A

ACCELERATOR

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Three Kinds of Accelerators:

A
  1. SODIUM CARBONATE
  2. SODIUM HYDROXIDE
  3. BORAX
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

It PREVENTS STAIN and MAKES the developing SOLUTION MORE STABLE AND LONG-LASTING.

A

PRESERVATIVE

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

The commonly used preservative is __________

A

SODIUM SULFITE

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

This chemical RESTRAINS THE ACTION OF THE EXPOSED AREAS OF THE FILM and permits control of density and contrast.

A

RESTRAINER

17
Q

__________ is the agent generally used for this purpose of Restrainer

A

POTASSIUM BROMIDE

18
Q

Types of Developers:

A
  1. TYPE A (D-72)
  2. TYPE B (D-19)
19
Q

A DEVELOPER FOR PRINTS. It PRODUCES A VERY HIGH CONTRAST FILM.

A

TYPE A (D-72)

20
Q

It is SUITABLE FOR DEVELOPING FILM EXPOSED UNDER DULL OR HAZY LIGHTING CONDITIONS.

A

TYPE B (D-19)

21
Q

This refers to the REMOVAL OF THE UNEXPOSED HALIDES which has the effect of making the developed image permanent. It is accomplished by TREATING THE FILM IN A CHEMICAL that makes the unexposed halides soluble in water so they may be washed out of the emulsion.

A

FIXING CHEMICALS

22
Q

This refers to FIXING CHEMICAL COMMONLY CALLED “HYPO”; it is one which dissolves the unexposed silver halides.

A

SODIUM THIOSULFATE

23
Q

This refers to fixing chemicals that is USED TO NEUTRALIZE THE DEVELOPER. When a negative is removed from the developer, the emulsion is saturated with the solution.

A

ACETIC ACID (28%)

24
Q

This refers to fixing chemical that is ADDED TO ACETIC ACID TO NEUTRALIZE THE DEVELOPER but CAUSES THE HYPO TO BREAK DOWN, liberating sulfur. It is a preservative just because it combines with sulfur to form new hypo.

A

SODIUM SULFATE

25
Q

This refers to fixing chemicals that is added to the fixing bath because it has the ABILITY TO TOUGHEN OR HARDEN the emulsion.

A

POTASSIUM ALUM

26
Q

This refers to the fixing chemical that is added to SLOW THE ACTION AND PROLONG THE USEFULNESS OF THE BATH. Adding the hardener to the fixing bath causes a MILKY SLUDGE to form and reduce the life of the solution.

A

BORIC ACID

27
Q

F. Equipment for Film Processing (Pallista, 2019) (TDOSTTFPFG)

A

(TDOSTTFPFG)
1.Tank or tray
2.Developing reel
3.Opener for film cartridge (pliers)
4.Scissors to cut the tongue of the film
5.Thermometer
6.Timer
7.Funnel
8.Photographic sponge
9.Film clips for drying
10.Glass or plastic bottles (gallon size) for storing mixed solutions

28
Q

G. Developer Formulation (Pallista, 2019)

Typical component: (SDPAR)

A

(SDPAR)
1.SOLVENT (WATER)
2.DEVELOPING AGENT
3.PRESERVATIVE
4.ACCELERATOR OR ACTIVATOR
5.RESTRAINER

29
Q

D-76 Film Developer Formula:

A

1.WATER 520 C — 750 ML
2.ELON — 2 GM
3.HYDROQUINONE — 5 GM
4.SODIUM SULFITE — 100 GM
5.BORAX (GRANULES) — 2 GM
6.WATER TO MAKE — 1 LITER

30
Q

Dektol - Paper Developer:

A

1.WATER 520C OR 125 OF — 500 ML
2.Elon — 311 GM
3.HYDROQUINONE — 12 GM
4.SODIUM SULFITE — 4.5 GM
5.SODIUM CARBONATE — 67.5 GM
6.POTASSIUM BROMIDE — 1 GM
7.WATER TO MAKE — 1 LITER

31
Q

Fixing Bath Formula: (WDPNH)

A

1.WATER
2.DISSOLVING AGENT
3.PRESERVATIVE
4.NEUTRALIZERS
5.HARDENERS

32
Q

Typical Fixing Formula:

A

1.WATER 520C OR 125 ⁰F — 600 ML
2.HYPO — 240 GM
3.SODIUM SULFITE — 15 GM (ANHYDROUS)
4.ACETIC ACID (28%) — 480 ML
5.BORIC ACID (crystals) — 7.5 GM
6.POTASSIUM ALUM — 15 GM (FINE GRANULAR)
7.WATER TO MAKE - 1 LITER

33
Q

This refers to the PRINT PROCESSING that USES THE SAME TECHNIQUES AS BLACK AND WHITE PRINTING with a couple of extra steps.

A

COLOR PRINTING

Forensic Photography (5 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions