Pre bubble shine tubes !
A friend gave me a pack of rods (with unidentified COE). the first problem it is to find the COE (i am working on that). The mystery has to do with with some shine tubes of 5-6 mm of diameter and 1 mm walls. When i start to warm them on torch they start to make very small air bubbles (hundreds of them). It looks very funny but until now i have never read or see this kind of effect (only in fusing ).
So does any one know this kind of tubes? company and COE ...
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Aude sapere.
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