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  2. Native copper - Wikipedia

    en.wikipedia.org/wiki/Native_copper

    Copper aureus (a variety of copper containing up to 3% Au); Copper is silver (a type of copper containing up to 7.5% Ag). Deposits and mines. The mines of the Keweenaw native copper deposits of Upper Michigan were major copper producers in the 19th and early 20th centuries, and are the largest deposits of native copper in the world.

  3. Purple - Wikipedia

    en.wikipedia.org/wiki/Purple

    Purple is a color similar in appearance to violet light. In the RYB color model historically used in the arts, purple is a secondary color created by combining red and blue pigments. In the CMYK color model used in modern printing, purple is made by combining magenta pigment with either cyan pigment, black pigment, or both.

  4. Lapis lazuli - Wikipedia

    en.wikipedia.org/wiki/Lapis_Lazuli

    Lapis is the Latin word for "stone" and lazulī is the genitive form of the Medieval Latin lazulum, which is taken from the Arabic لازورد lāzaward, itself from the Persian لاژورد lāžavard/lāževard and/or لاجورد lājevard. It means "sky" or "heaven"; so this is a "stone (of/from) the sky" or "stone (of/from) heaven". [11]

  5. Egyptian blue - Wikipedia

    en.wikipedia.org/wiki/Egyptian_blue

    Egyptian blue, also known as calcium copper silicate (CaCuSi 4 O 10 or CaOCuO (SiO 2) 4 (calcium copper tetrasilicate)) or cuprorivaite, [1] is a pigment that was used in ancient Egypt for thousands of years. It is considered to be the first synthetic pigment. [2] It was known to the Romans by the name caeruleum.

  6. Chemical coloring of metals - Wikipedia

    en.wikipedia.org/wiki/Chemical_coloring_of_metals

    Brown or black can be used as a base color for copper patina. If the amount of chlorides decreases the color will be more bluish-green, if carbonate decreases, more yellow-green. Black for copper. Solution of sodium polysulfide 2.5%, items must be submerged in the solution after color developing, wash, dry and wax or varnish colored object.

  7. Cherokee Purple (tomato) - Wikipedia

    en.wikipedia.org/wiki/Cherokee_Purple_(tomato)

    Cherokee Purple is the name of an old variety of tomato that develops a fruit with a deep, dusky-rose color while maintaining a somewhat greenish hue near the stem when mature for eating. The deep crimson interior and clear skin combination give it its distinctive color. It was one of the first of the darker color group of tomatoes sometimes ...