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One use not mentioned is to use toothpaste when hard soldering jewellery and you need to protect something close to the place being soldered, coat it with toothpaste and wash off after you have soldered the part. Works like a charm and saves time cleaning and buffing the piece if you don't use toothpaste.!!
Pasta Making Class
I didn't watch the video, as I live in a remote area and get internet via cellphone, so I don't watch videos as it takes too long to download and usually hangs before it completes. In the photo with the text, the top is on the bottle and is closed. I live in a desert and have been doing this for the last 2 years!!
When you put water into the bottles to go into the freezer, loosen the lid when you put it into the freezer. The water doesn't leak out and the bottle doesn't collapse as the air inside cools and contracts.