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Chemical composition of the solution, at the best of my (limited) knowledge is the ammonia complex of copper hypophosphite. Both reactions (at 125 and at 175 degrees) are thermolysis of this complex with the release of copper nanoparticles. During first phase most of the copper is released while second phase is reflow during which copper nanoparticles are joined together. I believe that operational window for both reactions +- 10-15 degrees. Note that I'm not a chemist and here I just repeating what (and how) I did get from papers and from discussions with chemists. So, take this information with care.
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Precision high speed micro drill press from 'Useful material'
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