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गाढश् च अभ्युद्धार्यश् च पेटकः सम्यूह्य अवलेप्य संघात्येषु क्रियते ॥
Folding (petaka) either firm (gádha) or loose (abhyuddhárya) is practiced in soldering, in preparing amalgams, and in enclosing (a piece of base metal with two pieces of a superior metal).
english translation
सीस रूपं सुवर्ण पत्त्रेण अवलिप्तम् अभ्यन्तरम् अष्टकेन बद्धं गाढ पेटकः ॥
When a lead piece (sísarúpa--lead coin) is firmly covered over with gold leaf by means of wax (ashtaka), that act is termed gádhapetaka, firm folding.
english translation
स एव पटल सम्पुटेष्व् अभ्युद्धार्यः ॥
and when the same is loosely folded, it is termed loose folding.
english translation
पत्त्रम् आश्लिष्टं यमकपत्त्रं वा अवलेप्येषु क्रियते ॥
In amalgams, a single or double layer (of a superior metal) is made to cover a piece (of base metal).
english translation
शुल्बं तारं वा गर्भः पत्त्राणां संघात्येषु क्रियते ॥
Copper or silver may also be placed between two leaves (of a superior metal).
english translation