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> What is in your water? |
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#11
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A while ago I thought I had problems with bits in the tap water that were sticking to my film after development. So I bought some big bottles of spring water. You know the sort of stuff..."This water comes from a 10,000 year old glacier in the Swiss Alps. .... Best before the 18th Feb."
Anyway I mixed my developer with it, washed the film with it. But I still got bits on the film. Turned out they were in the fixer, which had sort of precipitated out (i'm no chemist) into crystals. So my tap water turned out to be fine. Alan |
#12
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Swiss Glaciers
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As for the 'best before dates' I had a bottle of Isopropyl Alcohol with a similar message, I was still using it 5 years later! |
#13
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Here in Milton Keynes our water is hard and also delivers sand to my kettle, so I normally filter it for photographic use.
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Malcolm Stewart Milton Keynes |
#14
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Drinking water is full of all sorts of stuff as whilst its clean it doesn't have to be as clean as other grades of water, it also changes as water can be taken from different supplies. |
#15
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Water here in Somerset isn't too bad.
PH of 7.5 tap water and clear, at the moment although my darkroom supply is filtered with a modest cannister fitted to the outside wall feeding hot and cold. I also collect rainwater off the darkroom roof into 3 barrels which are filtered at the tap. I use this for alternative processes. PH for rainwater in barrels comes out at 6.5.
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aut viam inveniam aut faciam : Web mylaceyphoto.co.uk Blog mylaceyphotography.wordpress.com |
#16
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For those who are not familiar with the quote and XXXX W.C Fields said "I don't drink water, fish make love in it." |
#17
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In Europe, Germany led the way in environmental regulation and some of their photofinishers relocated their laboratories to neighbouring countries where rules were less stringent. Eventually the industry began to clean up and, in collaboration with photochemistry manufacturers, we designed equipment to collect and treat overflow and recreate replenisher. We measured pH, SG and conductivity inline so that precise quantities of solutions could be added to bring activity back into line. The concentration of some by-products inevitably increased as the liquids passed round and round the system - notably surfactants (added to film and paper emulsions to adjust coating thickness). To supress frothing, antifoam reagents were added to saturate the fatty end of the surfactant molecules. As with beer, it's difficult to measure volumes accurately if the head fills half the vessel. |
#18
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The clear film is because after a few days emulsion floats off the backing - either film or paper.
Martin |
#19
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I know that paper emulsion will break up after 4-5 days but this hasn't happened with the film -yet |
#20
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