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This nickel-based white master alloy — previously called White Century — is formulated for investment casting and fabrication of 9K–18K white gold. Specially engineered for peak performance in enclosed or automated casting equipment, it contains copper, nickel, and zinc, plus a small amount of silicon as a deoxidizer. Additional proprietary metals are present in the formulation that are not listed in the published composition. Sold by the troy ounce (20 pennyweight / 31.1 grams).
| Alloy Base | Nickel-based |
|---|---|
| Composition – Copper (Cu) | 57.7% |
| Composition – Zinc (Zn) | 18.1% |
| Composition – Nickel (Ni) | 24.2% |
| Additional Components | Silicon (deoxidizer); proprietary metals not disclosed in composition |
| Karat Range | 9K – 18K white gold |
| Sold By | Troy ounce (20 DWT / 31.1 g) |
| Part Number | 846-100 |
Pre-alloy all alloy and fine gold together with aggressive stirring and fluxing to ensure a uniform mixture before casting.
Flask Temperature: 580°C – 700°C / 1076°F – 1292°F, depending on flask size, karat, and jewelry type.
Fluxing: Fluxing white gold is critical for collecting oxides. Boric acid is the recommended flux. Do not use carbon fluxes or refining fluxes such as soda ash or saltpeter. Avoid flux in bottom-pour automatic casting units.
Quench Time: 10–15 minutes.
Investment Removal: Most standard investment removers will successfully remove investment powder. Aggressive acids cause stress corrosion and surface damage and are not recommended.
Scrap Reuse: A 70% fresh–30% scrap mix is recommended. White gold alloy has approximately one-third the reusability of yellow gold alloys.
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