Hello. I have been brewing for a few months and your advice has been extremely valuable. Thanks.
I have a question about glass bottles such as this one in the photo. I bleach them between use and have noted that some have developed this bubble pattern, which is permanent. Is it due to a coating on the glass? Is it hazardous to use these?
Thanks for your help
Regards
Rob
When I cleaned demi-johns and glass bottles by soaking in a solution of PBW and hypochlorite bleach I noticed a build up of some insoluble compound on the surface of the glass that looked similar to the photo above. Some sort of hard, waxy substance that was relatively difficult to scrub off. I have since stopped using bleach and all my newer bottles are OK. One neat way to sterilise demijohns (if you have a unit big enough) is to microwave them.
Does vigorous scrub with a demi-john bottle brush and a cleaning agent like PBW do anything? it may be worth trying if previously not attempted?
Have not had this happen to me, are you certain this is a change in the glass and not something being stuck on it?
I would be tempted to break one and get a closer look/feel/scratch.
I do notice that you are using clear glass bottles this is in general not considered good practices for beer as the hop has a substance that under light will turn into the same substance that skunks spray out. Not certain that this has anything to do with those bubbles tho.
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