[alt-photo] Re: Testing Paper PH

[G Schmitz]

The primary methods for testing pH in paper conservation involve using 
either "hot extraction" or "cold extraction."  It is usually best to 
used distilled or boiled and cooled water since CO2 concentrations in 
the water can lead to a "false" reading.

See for example:

http://ipstesting.com/T509pHcoldextract/tabid/155/Default.aspx

searching ConsDist might also provide some insights:

http://cool.conservation-us.org/byform/mailing-lists/cdl/

--greg

P.S. I know this topic has been discussed at some length before.  Might 
be worth giving the archives a poke.




On 7/28/10 4:11 PM, ender100 at aol.com wrote:
> I'll give it a try when I get the litmus paper.
>
>
> No need for an apology Paul.
>
>
> Mark
>
> Mark,
>
> I don't think that would work, but try it with a known highly alkaline paper.
>
> So sorry if I mispoke about PDN in earlier posts yesterday in reply to a question. I should've just referred them to you in the first place.
>
> Let's talk soon...
>
> Paul
>>> Mark Nelson
>>> www.PrecisionDigitalNegatives.com
>>> www.MarkINelsonPhoto.com
>>> PDNPrint Forum @ Yahoo Groups
>
>
>> Wetting the paper first with distilled water I might add.
>>
>> Mark Nelson
>> www.PrecisionDigitalNegatives.com
>> PDNPRint Forum @ Yahoo Groups
>> www.MarkINelsonPhoto.com
>>
>> sent from my iPhonetypeDeviceThingy
>>
>> On Jul 28, 2010, at 4:54 PM, ender100 at aol.com wrote:
>>
>>> I was trying to test the ph of a paper and found that my ph pen seems to>>  have bitten the dust.  It indicates basic regardless of what I test—even>>  my favorite balsamic vinegar seems to have turned alkaline.
>>>
>>>
>>> Would just wetting the paper and dabbing it with ph testing paper give>>  decent results?
>>>
>>>
>
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