It is very unpleasant when during preparation of cans for preparations they suddenly burst. Skilled hostesses can reduce the probability that bank will break during boiling.
For the best safety of preparations for the winter the banks should be chosen as clean, without damages and chips. Before to place preparations inside, the glass container needs to be processed properly for the purpose of disposal of microorganisms. Boiling of cans is recognized as one of the best ways.
Why glass in boiled water can burst
Sometimes when boiling in water the banks burst. From this trouble it is possible if not to get rid then to minimize. For this purpose hostesses resort to various tricks, boil banks with use of rags, plates, prosyanka, slightly heat glass before boiling. They cannot even explain some ways - simply ""all so do"".
The reason that glass bursts – its uneven expansion when heating. Than is thicker than bank, high probability subjects that it will break. Thick-walled glass gets warm worse, the identical extension in vessel is installed very slowly. If it is sharp to lower banks in boiled water, it can provoke emergence of microcracks because of which glass breaks.
That banks have not burst when processing by boiling, it is the best of all to warm them gradually, slowly. Uniform warming up, without sharp jumps of temperature will be provided to glass.
How to carry out boiling of cans
Put plate on bottom of big pan, above arrange banks. Everything should be filled in with water so that the container has been completely covered. If empty jars, inside too pour water, and to bank cover – it is desirable metal. But if banks boil together with the preparations put inside, they, of course, are already closed. It is necessary to establish banks so that when boiling they did not tap the friend about the friend – it can also lead to clinking. That banks did not adjoin, between them it is possible to lay smooth fabric. Water should be heated gradually, on average fire. After water has begun to boil, banks are kept in water depending on their volume: from 0.5 to 0.75 liters – 10 minutes, liter – is not less than 15 minutes, two-liter – 20 minutes. Three-liter boil of 25 minutes to half an hour. After this time the banks are carefully taken from boiled water, and in pan new are located.
During boiling, water from pan will gradually evaporate. To keep it at the previous level, it is necessary to add gradually and carefully – that water temperature in pan noticeably did not change.
Not to burn during extraction of cans from boiled water, it is possible to use nippers for meat, other auxiliary objects. There are also special devices for grab of neck, but they are suitable only for cans with preparations. But with their help the bank can get accurately, not really quickly – glass can burst not only from sharp change of temperatures from cold on hot, but sometimes and vice versa.