Author Topic: ColorpHast pH Strip Information  (Read 2896 times)

Offline mabrungard

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ColorpHast pH Strip Information
« on: October 25, 2012, 02:19:12 PM »
I received this interesting information from a friend of mine who spoke with a technical services representative from EMD, the producers of the ColorpHast plastic pH strips.

The Rep said that to use ColorpHast strips correctly, the strip immersion time must be from 1-10 minutes until no further change is noticed.  He said that this is because of the very low ionic concentrations of what brewers measure, (ie: water/mash/wort/beer).  He went on to say that the quick "Dip and Read" will NOT render a correct pH measurement.  He also confirmed that the strips do read about 0.2 - 0.3 units low at mash temp. So the findings of Kai Troester and AJ Delange about the readings of these strips are confirmed. 

Another thing the EMD Rep mentioned, was that ColorpHast strips have an expiration date of 3-5 years IF they are stored in a closed container with a desiccant (moisture-removing agent).  Apparently the strips are adversely affected by air moisture.   If the strips are not carefully stored and protected, they have a typical shelf life of 1-2 years.

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Online a10t2

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Re: ColorpHast pH Strip Information
« Reply #1 on: October 25, 2012, 11:21:06 PM »
Thanks, Martin! I think for my next few brews I'll compare a long immersion with the "dip and read". I've been trying to reconcile some inconsistencies I've been seeing with the strips, so this may explain some things.

I think a pH meter is going to be my next brewing toy...
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Offline tschmidlin

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Re: ColorpHast pH Strip Information
« Reply #2 on: October 25, 2012, 11:50:42 PM »
Thanks Martin, I may play with my strips again and see how they read.  They're old so they'll probably be off, but that's fine, I want to check it out anyway. :)
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Offline blatz

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Re: ColorpHast pH Strip Information
« Reply #3 on: October 26, 2012, 07:02:44 AM »
Thanks Martin - as always, bringing great info to the table.

I think a pH meter is going to be my next brewing toy...

you know what's funny, I still use the strips and a meter...then again I use my refracto and hydrometer and compare too - guess I'm weird.

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Online kramerog

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Re: ColorpHast pH Strip Information
« Reply #4 on: October 26, 2012, 07:49:12 AM »
I use Precision Labs' pH strips http://www.brewandgrow.com/brew/equipment/testing-measuring/ph-testing/ph-test-strips-beermaking-range.html.  I wonder if it suffers from some of the same issues.  I'll have to check it out.  Without ever using the ColorpHast, I think the Precision Lab stuff would work better because they operate over a narrower range.
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Offline narcout

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Re: ColorpHast pH Strip Information
« Reply #5 on: October 26, 2012, 09:10:23 AM »
He went on to say that the quick "Dip and Read" will NOT render a correct pH measurement.  He also confirmed that the strips do read about 0.2 - 0.3 units low at mash temp. So the findings of Kai Troester and AJ Delange about the readings of these strips are confirmed.


My experience has been that a 3 to 5 second dip is all it takes.   I have tested them a couple of times against my pH meter, and they definitely read around .3 units low (compared to a room temperature sample).

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Re: ColorpHast pH Strip Information
« Reply #6 on: October 26, 2012, 10:44:33 AM »
you know what's funny, I still use the strips and a meter...then again I use my refracto and hydrometer and compare too - guess I'm weird.

I'm the same way. They wouldn't be "toys" otherwise!
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Offline denny

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Re: ColorpHast pH Strip Information
« Reply #7 on: January 13, 2013, 01:58:38 PM »
Interesting info about a lab test of ColorpHast strips.....

http://www.brews-bros.com/topic/72972-interesting-information-about-colorphast-strips/
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