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what is the role of silver chloride and silver bromide in black and white photography?
Wiki User
∙ 10y ago
On exposure to light both compounds forms silver metal in very finely divided state. Inside a camera the bright areas of the image projected onto a photgraphic plate or film are exposed more and therefore more silver gets deposited. This produces a "negative" of the image which is then used to produce the photograph.
Wiki User
∙ 10y ago
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Why is silver bromide used in photography?
1) it reacts to light (by the intermediate of a photochemical reaction AgBr is decomposed in Ag and Br).2) unchanged it can be washed away.thus leaving a "photographic" image.Visible light decompose (a photochemical reaction) silver bromide; silver the black color on the phodos.Because it is the easiest-manipulated compound that is most affected by exposure to light.
How is iodine used in photography?
it is used in the compound silver iodide and it reflects the light. it is essentially the basis of black and white photography.
What happens when silver is exposed to sunlight?
When light shines on the silver chloride/albumin emulsion the redox reaction happens more quickly than it does in the dark. Imagine now a sensitized sheet of paper, half of which is exposed to bright sunlight and the other half of which is covered up with an opaque card. The silver ions in the exposed area will be reduced to black metallic silver in a matter of minutes; the silver ion under the card will remain colorless or white. Imagine now that you remove the opaque card; what will you see? The half of the paper that was in the light will be black and the half that was in the dark will be white. This reversal of light and dark is referred to as a negative image. But as soon as you remove the opaque card from the sensitized paper, the formerly unexposed white half will begin to turn black. In order to fix the image, we need to remove the light-sensitive silver chloride. Just washing it in water won't do the trick because silver chloride is insoluble in water. The earliest photographic fixer consisted simply of a concentrated solution of sodium chloride, ordinary table salt: While certainly convenient, this reaction does not go very far; only some of the silver chloride is dissolved and the rest remains on the paper. More effective than salt is ammonia.
Why does silver nitrate turn blue?
Silver Nitrate does not turn blue - it turns purple-black and then black. It was the basis for early photography before the digital age.
What is the equation of silver sulfide forms when silver and sulfur react?
The molecular formula for Silver sulfide is Ag2S
Used in film and turns black in light?
For example silver bromide or chloride.
What are some other reactions that depend on light?
Some reactions that depends upon light are:Silver chloride turns grey in sunlight .This is due to the decomposition of silver chloride into silver and chloride by light.Silver bromide also decomposes like silver chloride.These reactions are generally called photo decomposition reaction .These reactions are also use in black & white photography.
What is the name of the compound used to take black and white photos?
actually not silver chloride but silver bromide AgBr is used in black and white photography as a soft, pale yellow, insoluble salt well known (along with other silver halides for its unusual sensitivity to light. This property has allowed silver halides to become the basis of modern photographic materials. AgBr is widely used in black and white photography film The classic black and white film would be made using silver bromide which is made from silver nitrate. Silver nitrate is a chemical compound with chemical formula AgNO3. This nitrate of silver is not the light sensitive ingredient in photographic film .
How to test chloride ion?
Add dilute nitric acid and silver nitrateResult - A white precipitateAdded:...... but be aware that Bromide and Iodide (and some other anions) will react almost accordingly. So it isn't too specific!However, if you look very closely, the bromide ion turns a cream coloured precipitate, and the iodide ion, a yellow precipitate. Silver chloride and -bromide will turn in grey black after some time exposed to light (photographic illuminate-reaction)
Can silver be a different color?
Finely powdered silver is black in color (which is what made it useful for black and white photography - now largely superseded by digital photography).
What will happen if the silver bromide is kept for some time in sunlight?
The silver ions in the exposed area will be reduced to black metallic silver in a matter of minutes.
Why is silver bromide used in photography?
1) it reacts to light (by the intermediate of a photochemical reaction AgBr is decomposed in Ag and Br).2) unchanged it can be washed away.thus leaving a "photographic" image.Visible light decompose (a photochemical reaction) silver bromide; silver the black color on the phodos.Because it is the easiest-manipulated compound that is most affected by exposure to light.
How is iodine used in photography?
it is used in the compound silver iodide and it reflects the light. it is essentially the basis of black and white photography.
What happens when silver is exposed to sunlight?
When light shines on the silver chloride/albumin emulsion the redox reaction happens more quickly than it does in the dark. Imagine now a sensitized sheet of paper, half of which is exposed to bright sunlight and the other half of which is covered up with an opaque card. The silver ions in the exposed area will be reduced to black metallic silver in a matter of minutes; the silver ion under the card will remain colorless or white. Imagine now that you remove the opaque card; what will you see? The half of the paper that was in the light will be black and the half that was in the dark will be white. This reversal of light and dark is referred to as a negative image. But as soon as you remove the opaque card from the sensitized paper, the formerly unexposed white half will begin to turn black. In order to fix the image, we need to remove the light-sensitive silver chloride. Just washing it in water won't do the trick because silver chloride is insoluble in water. The earliest photographic fixer consisted simply of a concentrated solution of sodium chloride, ordinary table salt: While certainly convenient, this reaction does not go very far; only some of the silver chloride is dissolved and the rest remains on the paper. More effective than salt is ammonia.
Why do you store silver chloride in dark coloured room?
TO prevent the siver halides from decomposition...as when it comes in contact of light the photo decomposition takes place.....BY- MOHIT GAUTAM
Why does silver nitrate turn blue?
Silver Nitrate does not turn blue - it turns purple-black and then black. It was the basis for early photography before the digital age.
Why are silver compounds used in photography?
Silver is used in film media because it tarnishes better than other materials.Tarnish is the process of oxidation, where a metal turns from some some shiny color to a darker non-shiny color.Three Examples of Tarnish:Gold: Starts a bright shiny gold color and tarnishes to a slightly darker dull gold colorCopper: Starts a bright shiny orange-gold color and tarnishes to a green patina colorSilver: Starts a bright almost white color and tarnishes to a very dark grey, almost black colorSilver provides the best tonal range, from light to dark. It can capture light from pure white to pure black (or very close).Additionally, silver tarnishes very consistently. This provides a smooth transition from light to dark on film.
