We show the chemistry of photography using silver chloride that we make ourselves from table salt and silver nitrate.
Silver chloride has the interesting property that it reacts to light. This photosensitive chemical will decompose into dark silver powder and chlorine.
To make it, just mix one gram of silver nitrate made in our previous video ( http://www.youtube.com/watch?v=d6hPgGV_qAg ) and half a gram of salt in separate quantities of water. Then mix the two solutions with shaking, this forms silver chloride. Then let it stand for five minutes. This will cause the silver chloride to settle to the bottom. After five minutes pour off the extra liquid. Spread out the silver in a layer onto a piece of paper. Let it dry in darkness as you don’t want the light to expose it before you’re ready. Once it is dry, place a stencil or template of something you want “photographed” over the silver chloride. You might want to weigh it down with a piece of glass.
When you’re ready, shine a strong light onto it for ten minutes or so. The silver chloride will darken in the areas that are exposed to light. Remove the glass and template and you will have a negative photo of what you placed over it.
The image won’t keep forever, eventually the whole thing will darken.
This is ofcourse a very simple experiment and modern photography is far superior.
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Our website at: http://www.nurdrage.com
Duration : 0:1:52
March 5th, 2010 at 11:30 pm
when it decomposes …
when it decomposes it forms chlorine right?
March 5th, 2010 at 11:30 pm
can you fix it? …
can you fix it? congratulations!
March 5th, 2010 at 11:30 pm
HA, didn’t let mine …
HA, didn’t let mine dry:P
But i’ll post the video soon..
March 5th, 2010 at 11:30 pm
i play and have …
i play and have done for a long time and i dont have long nails
March 5th, 2010 at 11:30 pm
cool for nurds
cool for nurds
March 5th, 2010 at 11:30 pm
Yes:
2 AgCl — …
Yes:
2 AgCl –light–> 2 Ag + Cl2
March 5th, 2010 at 11:30 pm
If he playes the …
If he playes the guitar, he has to have long nails
March 5th, 2010 at 11:30 pm
Yes, it does
Yes, it does
March 5th, 2010 at 11:30 pm
This is interesting …
This is interesting! Cool to know how this works.
March 5th, 2010 at 11:30 pm
it helps people
it helps people
March 5th, 2010 at 11:30 pm
does it also make …
does it also make NaNO3?
March 5th, 2010 at 11:30 pm
that would be an …
that would be an acceptable reason
March 5th, 2010 at 11:30 pm
he probley plays …
he probley plays guitar
March 5th, 2010 at 11:30 pm
love your videos …
love your videos and im a subscriber but seriously, your nails are a little too long
March 5th, 2010 at 11:30 pm
CAN I KEEP IT?
IS …
CAN I KEEP IT?
IS IT SOLID?
March 5th, 2010 at 11:30 pm
I tried this, it …
I tried this, it works great! Is it releasing chlorine gas?
March 5th, 2010 at 11:30 pm
Yes, with a …
Yes, with a rehalogenating bleach, for example a solution of potassium ferricyanide and sodium bromide, or in this case you probably want sodium chloride – which should work – I think.
March 5th, 2010 at 11:30 pm
You can mix it with …
You can mix it with food gelatin found at stores to make an emulsion layer you can spread over something rather than straight powder.
March 5th, 2010 at 11:30 pm
Its already …
Its already developed by exposure to light which does a similar thing as short exposure + chemical development
March 5th, 2010 at 11:30 pm
With fixer.
You …
With fixer.
You can make your own universal fixer from sodium thiosulphate (found at pool supply stores) or just use fixer.
March 5th, 2010 at 11:30 pm
ಠ_ಠ
ಠ_ಠ
March 5th, 2010 at 11:30 pm
really cool …
really cool experiment!
March 5th, 2010 at 11:30 pm
cool 5/5
cool 5/5
March 5th, 2010 at 11:30 pm
I see you’re …
I see you’re backed-up with questions here lol. But can te AgCl be recycled, so that darkened powder can be re-lightened? Preferably without requiring chlorine gas to do it haha.
Great video though, thanks for sharing!
March 5th, 2010 at 11:30 pm
how would you fix …
how would you fix the image, or stop it from further developing