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Purple gold (also called amethyst gold and violet gold) is an alloy of gold and aluminium rich in gold–aluminium intermetallic (AuAl 2). Gold content in AuAl 2 is around 79% and can therefore be referred to as 18 karat gold.
Colloidal gold is a sol or colloidal suspension of nanoparticles of gold in a fluid, usually water. The colloid is coloured usually either wine red (for spherical particles less than 100 nm) or blue-purple (for larger spherical particles or nanorods).
Gold–aluminium intermetallic. A schematic cross-section of a purple plague in a wire-bond of gold wire on an aluminium pad. (1) Gold wire (2) Purple plague (3) Copper substrate (4) Gap eroded by wire-bond (5) Aluminium contact. Gold–aluminium intermetallic is a type of intermetallic compound of gold and aluminium that usually forms at ...
For treatments that change the natural color of gold, see Colored gold. For the element, see Gold. Gold, also called golden, is a color tone resembling the gold chemical element. The web color gold is sometimes referred to as golden to distinguish it from the color metallic gold.
In common English usage, purple is a range of hues of color occurring between red and blue. [1] However, the meaning of the term purple is not well defined. There is confusion about the meaning of the terms purple and violet even among native speakers of English. [2]
It can be used on copper and its alloys, silver, nickel, iron, gold. The color depends on the duration of immersion, the sequence of colors on brass: Golden yellow-copper-purple-dark, blue-light, blue-chrome-nickel-red-grey, blue, and gray-black to iron or carbon steel.