Brainscape's Knowledge GenomeTM

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


See full index

Forensic 1 > 6 > Flashcards

6 Flashcards

1
Q

This refers to a cellulose tape or plate where silver salts are suspended that are capable of recording light.

A

Film

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

This refers to top layer; scratch – resistant coating; gelatine coating; an over – coating composed of a thin transparent layer of hard gelatine which helps protect the silver halide emulsion from scratches and abrasions.

A

Top Coating/Varnish Coating/Protective Coating –

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

This refers to structure of film that composed of silver halides and gelatine – a layer composed of silver compounds (which are light sensitive) and halogens (such as bromide, chloride, and iodide which is used in small amounts, seldom made more than 5% with silver bromide in fast film emulsion).

A

Emulsion Layer/Inert Gelatin

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

This refers to structure of film that is made of
cellulose acetate or other materials such as paper, plastic, or glass which supports the emulsion layer and is coated with a non – curl anti – halation backing.

A

Film Base/Backing/Base

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

This refers to a black dye applied on the rear surface of the film, it absorbs light that may penetrate the emulsion layer to prevent it from reflecting back to the emulsion thus making the mage sharper since it suppresses double image, and prevents the appearance of halo formation in the photograph.

A

Anti – halation Backing/Anti – Curl

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

This refers to emulsion layer that consist of three (or four) layers stacked one on top of another with filter in between each. These separate layers record the green blue and red values that go on making all colors, because all colors can be made of mixtures of red, blue and green which are called primary colors.

A

Structure of Color Film

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

This refers to film that is sensitive to a single color
of light.

A

Monochromatic Film

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

This refers to film that is more sensitive to blue rays of light.

A

Blue Sensitive Film

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

This refers to film that is sensitive to UV rays only.

A

Ultra – Violet Sensitive Film

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

This refers to film that is sensitive to ultra – violet
rays, and all light found in the visible spectrum, especially to blue and violet light, suitable for general use in the preparation of black – and – white photographs and most commonly used in investigative photography because it produces the most natural recording of colors.

A

Panchromatic Film

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

This refers to film that is sensitive to UV rays,
blue and green colors but not to red

A

Orthochromatic Film

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

This refers to film that is sensitive to infra – red and ultra
– Violet radiation, which is beyond the human eye’s sensitivity, also sensitive to all the colors found in the spectrum, and useful in penetrating haze because of its longer wavelength. It is useful in laboratory analysis of questionable documents; in the discovery of old or faded tattoos or areas where small objects are hidden under the skin; and in the construction of camera traps.

A

Infrared Film

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

This refers to film sensitivity to light.

A

Film Speed

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

ASA meaning

A

Americal Standards Association)

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

DIN meaning

A

Deutche Industries Normen

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

This refers to film intended for B and W
photography.

A

Black and White Film

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

This refers to films that have name ending in Color – color
negatives for prints.

A

Color Film

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

This refers to a material which is sensitive to X – ray region
of the electromagnetic spectrum.

A

X – ray Film

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

This refers to layer of photographic paper that contains silver halides suspended in gelatine; the layer making the paper light sensitive; emulsion maybe composed of silver chloride, silver bromide, or silver chlorobromide.

A

Emulsion Layer

20
Q

This refers to layer of photographic paper that is a gelatine layer containing barite crystals (barium oxide) to increase the reflectivity of the paper; the layer that makes the film glossy.

A

Baryta Layer

21
Q

This refers to layer of photographic paper that is made of hard paper which must be chemically pure; chemical content does not change or react with light or other chemicals during printing.

A

Base

22
Q

This refers to the combination of its texture and finish; texture
maybe smooth fine grained, or rough and finish maybe glossy (semi – matt) and matt.

A

Surface

23
Q

This refers to coating that is made up by using a layer of paper which is coated both sides with a synthetic polymer, usually polyethylene; forms the base on to which the emulsion is coated.

A

Resin – coated (RC) papers

24
Q

This refers to coating that can be air – dried, needs large volumes of water for effective washing that can be reduced with washing aid

A

Fiber – based Papers

25
Q

This refers to types based on
emulsion with slow emulsion speed; for contact printing; image size is the same as that of the negatives; they give blue black tones in a 65 – 68 degrees F to develop.

A

Silver Chloride Papers (Chloride Papers)

26
Q

This refers to types based on
emulsion with fast emulsion speed; for projection printing (enlarging); about 100 to 1000 times as sensitive as chloride papers; they give black tones in metal hydroquinone developers and take about 1 ½ minutes to develop at 18 – 20 degrees C; give neutral to cold black tone which is only affected by development type and techniques.

A

Silver Bromide Papers

27
Q

This refers to types based on emulsion that the slow is used for contact and the fast is used for
enlargement/projection printing; they give an image tone from warm black to reddish brown, depending on length of exposure, type, dilution and duration of developer

A

Silver Chlorobromide

28
Q

This process stops development by neutralizing the effects of the developer.

A

Stop Bath

29
Q

This stage also removes the unexposed and undeveloped halides by converting them to soluble salts which may be washed from the emulsion.

A

Fixing Bath or Fixing

30
Q

makes the image permanent in white light

A

Fixing Bath or Fixing

31
Q

This refers to paper weight that is intended for purposeswhich involve folding

A

Light Weight

32
Q

This refers to paper weight for all ordinary photographic purposes.

A

Single Weight

33
Q

This refers to paper weight for large prints because they stand up better rough treatment.

A

Double Weight

34
Q

This is the final part of the processing cycle, which removes the residual chemicals and soluble silver compounds from the emulsion and reveals the image.

A

Washing

35
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) hydroquinone and (2) Metol.

A

Reducing Agent

36
Q

are to energize the reducing agents and they soften and swell the emulsion to permit the developer to penetrate deeply and quickly.

A

Accelerators

37
Q

It prevents stain and makes the developing solution more stable and long lasting.

A

Preservative

38
Q

This chemical restrains the action of the exposed areas of the film and permits control of density and contrast.

A

Restrainer

39
Q

commonly used preservative is

A

Sodium Sulfite.

40
Q

the agent generally used for this purpose.( restrainer )

A

Potassium bromide

41
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

A

Sodium Sulfate

42
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

43
Q

This refers to the fixing chemical that is added to slow the action and prolong the usefulness of the bath.

A

Boric Acid

44
Q

Fixing Bath Formula

A
  1. Water
  2. Dissolving agent
  3. Preservative
  4. Neutralizers
  5. Hardeners
45
Q

Typical component

A
  1. Solvent (water)
  2. Developing agent
  3. Preservative
  4. Accelerator or activator
  5. Restrainer

Forensic 1 (2 decks)

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