Selective Dealloying¶
Selective dealloying preferentially removes one alloy constituent, leaving an enriched surface or reorganized residual network.
Core Idea¶
Selective dealloying removes one component of an alloy more readily than another. The remainder becomes enriched at the surface or reorganizes into a porous network. Depletion gilding of gold–copper alloy is one narrower case; not all selective dealloying is gilding or makes pores.[ref-7e278a5a227d][ref-265b1d95eab5]
Scope of Application¶
The Museum describes heating tumbaga to form surface copper oxide, then using acidic plant juice to remove copper and leave a fine gold-rich skin. Silver removal from gold–silver alloy can yield nanoporous gold when residual gold moves and reorganizes. The first is the narrower depletion-gilding instance, not a synonym for every dealloying outcome.[ref-7e278a5a227d][ref-265b1d95eab5]
Clarity¶
The metal left behind was already present. Adding gold by plating is a different process. Here “dealloying” is the selective-dissolution corrosion term, not any generic alloy-processing step.
Manages Complexity¶
Separating selective chemistry from final morphology helps explain why one treatment yields a skin and another yields a network.
Abstract Reasoning¶
Identify the alloy constituents, the preferentially attacked component, and the transport of what remains. Inspect the resulting surface; do not infer it from the word “dealloying” alone.
Knowledge Transfer¶
The differential-removal mechanism travels between decorative metallurgy and nanomaterials, while recipes, depths, and intended properties do not. The strict Selection relation captures differential retention and composition change; alloy chemistry specifies the narrower child rather than redefining the general prime.
[^ref-7e278a5a227d]: Julie Jones and Heidi King, Gold of the Americas, Metropolitan Museum of Art Bulletin 59(4) (2002), printed p. 4. Only the publisher-indexed paragraph was consulted; the full PDF was not inspected. [^ref-265b1d95eab5]: Erlebacher et al., “Evolution of Nanoporosity in Dealloying,” free author manuscript, pp. 1–3; published in Nature 410 (2001), 450–453.
Relationships to Other Abstractions¶
Current abstraction Selective Dealloying Domain-specific
Parents (1) — more general patterns this builds on
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Selective Dealloying is a kind of Selection Prime
Selective dealloying is differential retention of alloy constituents under chemical attack.
Hierarchy path (1) — routes to 1 parentless root
- Selective Dealloying → Selection
Neighborhood in Abstraction Space¶
Selective Dealloying sits in a sparse region of the domain-specific corpus (87th percentile for distinctiveness): few abstractions share its structure, so a faithful description tends to retrieve it precisely.
Family — Unclustered & Miscellaneous (2551 abstractions)
Nearest neighbors
- Composition of causes — 0.82
- Processing-Structure-Property Relationship — 0.81
- Topological insulator growth — 0.81
- Sintering — 0.81
- Cis effect — 0.80
Computed from structural-signature embeddings · 2026-10-08