Ортофосфорной вытравливал
обломок стальной шпильки из дюралевого блока двигателя скутера
Вытравливал сломанный винт лимонной кислотой. Ступицу в кружку металлическую, кислоты лимонной, воды, и кипятить на маленьком огне. Часов за пять вытравится
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