I discovered this method by accident a few years ago while trying to clean an old bottle. I found an old demijohn outside and well past being able to clean it and more wanting to try this out!!
It’s dead simple, get a washing up bowl and add really cold water enough to cover the bottom of the demijohn, about a couple of inches. Leave it in there for a while to make sure the base is nice and cold. Then just boil the kettle and pour in the boiling water. If your lucky it should crack instantly and the bottom just drop out. If not give it a twist.
There you have it instant mini green house, the best part is you recycle something thats otherwise useless and it won’t blow away like plastic bottles.
wow, thats clever.
now if only i made beer lol
I’m just full of them today.
Thats a VERY good idea!
I shall be down at our local recycling centre tomorrow to find all the nasty unbrewablein demijohns I can find before the spring arrives and they all disappear!
Thank you for that m’dear!
hi very good i just tried it twice in fact it dose not work
the iced water i used was very cooled .i left the demijohn
in for 10 mins and then added boiling hot water and nothing
I’m sorry Mark about that but it worked for me, perhaps it’s due to the glass being outside for a long time? I’ll give it another go soon and tell you how it turns out.
Try it this way
Use a blow torch on the bottom, then place it in ice water
Should cause it to break every time, we break more glass wear in chemistry by that method than any other, Hot to cold is much better, you can use that to crack stone.