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A tornadoes color is determined by how the light falls on it, and often the color of soil that it is lifting up.
Red is often associated with danger, warning, and trouble. It is a bold and attention-grabbing color that is commonly used in signage and alerts to indicate potential issues or problems.
THE Liberty's face was copper color (color of a penny)
Colloidal copper has a slight blue color.
Green stains (copper color) that cannot be removed indicate you might have a pH problem. K
A green color in a meteor may indicate the presence of copper in the meteor.
Copper changes color to green either because of the weather or a physical change
The color fades as there is a discharge of copper two ions to form copper atoms
A rock's color may be an indication of its mineral content. Some generalizations--A red coloration usually indicates the prescence of iron, small grayish crystals are usually quartz, greenish or bluish colorations indicate a copper content, while white may indicate a feldspar mineral or quartz.
Copper takes on a brownish color, I've used copper dust in chem that was greenish-blue, that's a pretty popular color. when copper is burnt it produces a green flame, I've also used copper that was gray and greenish-blue in non manufactured copper things I'd look for a bluish green color.
The metallic PMS color for copper is 876 C. Ignacio Martinez
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