Author Topic: Gallotannin purple color?  (Read 1162 times)

Offline erockrph

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Gallotannin purple color?
« on: January 16, 2018, 04:32:18 PM »
Has anyone using BTB, or any other gallotannin antioxidant, noticed a change in your water or beer color when using it. I've been using FT Blanc in my strike water for the past year, with a definite improvement in my beer.

I don't normally prepare my strike water the  night before brewing, but I wanted to save some time today so I added my salts and tannin to the kettle last night. When I took the lid off the kettle this morning, the water was deep purple in color, like watered down grape KoolAid.

I freaked out and dumped the water, then cleaned my kettle with hot water. On take two I added my salts but waited on the tannin until closer to strike temp. My strike water was clear, but I held some back to do a step mash. By the time I was boiling the remaining water, it was back to purple.

I've decided to let it roll and see how the beer turns out. My guess is that this is from the tannin chelating iron and/or manganese in my water and will drop out when the beer clears. I've noticed that my wort looks muddy/stained, but my finished beers look great. I'm guessing that this has been happening all along and I just happened to "catch it in the act" today.

Anyone else have any thoughts on what this could be? Here's a pic I took of the water before I dumped it outside:



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Offline klickitat jim

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Re: Gallotannin purple color?
« Reply #1 on: January 16, 2018, 04:46:11 PM »
I've used Brewtan B in the mash using my well water and in distilled, no purple haze

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Re: Gallotannin purple color?
« Reply #2 on: January 16, 2018, 05:05:25 PM »
I get it once in a while, but seldom.  For me it's more faint pink than purple.  I've only noticed it on the strike water, not the beer.  No idea why.  It was discussed on brews-bros.com maybe a year ago and the conclusion was that although weird, it didn't make any difference to mash performance or beer color. I think someone even contacted Joe about it.
« Last Edit: January 16, 2018, 05:07:16 PM by denny »
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Offline mainebrewer

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Re: Gallotannin purple color?
« Reply #3 on: January 16, 2018, 05:30:08 PM »
I also get a slight pink color in my mash when using BtB.
It doesn't carry over to the beer color or the flavor, as far as I can tell.
Most recent brew using BtB was a German Pilsner.
Which I think would be a likely candidate for showing a color or taste impact.
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Offline HoosierBrew

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Re: Gallotannin purple color?
« Reply #4 on: January 16, 2018, 05:37:02 PM »
I haven't experienced that yet but I use all RO water, where I'm pretty sure some of you guys use well or local water (at least partially).  I wonder if there's a connection?
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Offline erockrph

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Re: Gallotannin purple color?
« Reply #5 on: January 16, 2018, 06:15:04 PM »
I haven't experienced that yet but I use all RO water, where I'm pretty sure some of you guys use well or local water (at least partially).  I wonder if there's a connection?
That's my guess. I started using the gallotannin because I have iron and manganese in my well water and wondered if it would help deal with those in my beer. I'm wondering if this is a metal-tannin complex of some sort.

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Offline hopfenundmalz

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Re: Gallotannin purple color?
« Reply #6 on: January 16, 2018, 06:20:51 PM »
In antique glass the purple to some shades of blue were due to Manganese in the glass.
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Re: Gallotannin purple color?
« Reply #7 on: January 16, 2018, 08:28:05 PM »
I haven't experienced that yet but I use all RO water, where I'm pretty sure some of you guys use well or local water (at least partially).  I wonder if there's a connection?

I use well water that's remarkably consistent, but I get the color about 15% of the time.
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Offline ynotbrusum

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Re: Gallotannin purple color?
« Reply #8 on: January 16, 2018, 11:49:00 PM »
I get pink and Joe F suspected that it was some iron chelation by the BTB.  No effect on final beer.
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Offline Philbrew

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Re: Gallotannin purple color?
« Reply #9 on: January 21, 2018, 04:27:16 AM »
Never had a color change from using BtB. 
I stopped using BtB because it seemed to have no effect on my beer quality.  But then, I use only RO water that is a very consistent 12 ppm TDS (I think mostly NaCl).
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Offline BrewBama

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Gallotannin purple color?
« Reply #10 on: May 26, 2018, 01:30:40 AM »
Alestateyall pointed me to this thread when I sent him the below photo of the break just before the boil. The mash had the same rosey pink-ish tint.  I use distilled water and add minerals per Bru’n water profiles (this was ‘Yellow Dry’).




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Re: Gallotannin purple color?
« Reply #11 on: May 26, 2018, 03:54:26 PM »
Yeah, mine sometimes does that, too.  Haven't found it to be a problem, though.
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Offline BrewBama

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Re: Gallotannin purple color?
« Reply #12 on: May 26, 2018, 05:07:57 PM »
Thx Denny.

Are you also using Ascorbic Acid and/or Potassium or Sodium Metabisulfate (aka the ‘Trifecta’ mix)?


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Re: Gallotannin purple color?
« Reply #13 on: May 26, 2018, 05:16:47 PM »
Thx Denny.

Are you also using Ascorbic Acid and/or Potassium or Sodium Metabisulfate (aka the ‘Trifecta’ mix)?


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Nope.
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Offline Horseflesh

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Re: Gallotannin purple color?
« Reply #14 on: June 01, 2018, 05:59:38 PM »
This thread is well timed. I just encountered pink discoloration from BTB too. I also got a pink-brown deposit on some of the equipment. This hue is also visible in my silicone hoses now. (phillips bit provided for color comparison to rust, which was the first thing I worried about when I got the pink.)



The weird thing is, I have been using BTB for a while and it just started happening--using the exact same equipment and ingredients that yielded no pink before. I changed nothing.

Can anyone suggest what may have changed? Why do I get the pink now when everything should be the same?

I can think of only 2 possibilities.

- My tap water changed. It's practically RO, but I did write the water district to see if anything is different lately.

- Hidden rust source in my stainless equipment (??)

How much iron do you need to get the pink complex? The only rust sources I am sure of are a couple pinhead-sized specks on my E-BIAB mash basket. If I had more rust hiding in the various basket seams I would think I would be able to see something, even just rusty water as it drips dry.

I'm really stumped!

EDIT TO ADD: In another forum I read that iron + BTB causes a GREEN precipitate, not pink. So now I don't know what to believe!
« Last Edit: June 01, 2018, 06:04:41 PM by Horseflesh »