Горение спирта с борной кислотой .
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![Дезинфицирующее средство для рук горит невидимым пламенем [Steve Mould на русском]](https://sun9-34.userapi.com/cvykoBCPB6AgUXIx-jw_wi8_KNjSF6TUu181mw/9dx01QOYHzk.jpg)
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