hist-brewing: bottles

Kirsty Pollock kirsty.pollock at mpuk.com
Thu Aug 24 09:13:25 PDT 2000

Well I've always kept my beer in a nice cool dark room as I know light/heat
exposure can cause chemical reactions which may well produce off flavours.

Not many beers (as opposed to lagers) come in clear or green bottles in the
UK. Usually they are dark brown, but I can think of some notable exceptions.
Must try your experiment with a bottle of Hobgoblin or suchlike.


> -----Original Message-----
> From: Mills, Scott [mailto:Scott.Mills at COMPAQ.com]
> Sent: 24 August 2000 15:59
> To: 'Kirsty Pollock'; 'Marty Twombly'; 'hist-brewing at pbm.com'
> Subject: RE: hist-brewing: bottles
> You right that light doesn't have anything to do with 
> bittering but it does
> with ODOR.
> UV light will react with the bittering compounds in hops and 
> covert some
> into 3-methyl crotyl mercaptan which is the same compound 
> that in in the
> spray of a skunk.  This distinctive compound is detectable by 
> most people in
> as small a quantity as a few parts per billion.
> If the brew you are putting in clear bottles doesn't have 
> hops in it then
> there is nothing to worry about.  Otherwise you need to keep 
> it in the dark.
> It's easy to try/see this for yourself.   Go to you local 
> beverage mart an
> get a couple of beers in green bottles.  Ideally get the 
> shopkeeper to get
> some from an original case box that have not been exposed to 
> light so they
> are not already skunked.  (We have found that Moosehead works 
> well for this
> experiment).  Take a few bottles home and place one in direct 
> sunlight for
> an our or so.  We have a window that gets a lot of evening 
> sun and we will
> just sit it in the window sill for a while.   After it has 
> been expose to
> the light for a while put it back in the fridge and then get 
> together with
> you fellow beer geeks and compare it to a beer that was not 
> exposed to the
> light.  You will be amazed.
> Some big commercial brewers that but beer in clear bottles 
> are isomerized
> hop oils for flavoring and aroma (mostly aroma) because they 
> are not as
> susceptible to light.  Unfortunately these oils aren't 
> readily available to
> the average homebrewer.
> Just FYI some of the cheaper beer kits actually have plastic 
> bottles in them
> and you can actually buy Amber plastic beer bottles and spare 
> caps.  Just go
> to your favorite search engine and do a search for something like  
>                   PET plastic Amber Beer Bottle
> You will find that they are available via mail-order in various sizes.
> Regards,    
> _________________________
> Scott Mills 
> Scott.Mills at Compaq.Com 
> > -----Original Message-----
> > From: Kirsty Pollock [mailto:kirsty.pollock at mpuk.com]
> > Sent: Thursday, August 24, 2000 4:33 AM
> > To: 'Marty Twombly'; 'hist-brewing at pbm.com'
> > Subject: RE: hist-brewing: bottles
> > 
> > 
> > They seal perfectly well and the colour of the container has 
> > nothing to do
> > with the 'bittering' (As far as I know). That's achieved by 
> > the bittering
> > agents added at brewing time. You do want to keep them in a 
> > dark place for
> > maturing (after the intital couple of weeks to let the secondary
> > fermentation in the bottle happen) if the bottles are clear, 
> > but I do that
> > with all of my beers irregardless of container colour. 
> > 
> > I find beer tastes best when fermented at no more than 18C - 
> > my summer made
> > brews don't seem to have the same depth of flavour. 
> > Maturing-wise anything
> > below 12-13 C and above 3C seems fine.
> > 
> > KP
> > 

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