शुल्बं तारं वा गर्भः पत्त्राणां संघात्येषु क्रियते ॥ कZ_०२.१४.३० ॥
śulbaṃ tāraṃ vā garbhaḥ pattrāṇāṃ saṃghāṭyeṣu kriyate
Dans les compactages laminés de feuilles, on fait du cuivre ou du fil le « noyau/cœur » (garbha) à l’intérieur (c’est‑à‑dire un métal de base dedans et une feuille au dehors).
Placing a cheaper metal core (copper/wire) inside a laminated leaf structure so the outside looks precious while the inside is not.
Assaying must test interior composition (cut tests, drilling, density checks), not only surface appearance.