Re: [CBQ] Mineral red vs Indian red - which was more red (or brown)?

["Randy Hees via CBQ" <randyhees=gmail.com@groups.io>]

As those names are used within the paint industry (not as specifically used by the CB&Q), both are based on oxides of iron, but  "Indian Red" is a specific color, classed as a manufactured color, derived from waste acid from steel mills, which had been used to scale from iron. That waste acid is treated to remove the acid (for reuse) then roasted. "Its quality, shade and strength vary according to the care and ability shown by its manufacture... (it is) a deep, rich red color with a purple tinge" (From F N Vanderwalke, The mixing of Colors and Paints, (Fredrick J Drake & Sons, Chicago, 1924). You will find Indian red in 19th and early 20th century paint cards, and it is the same color across most manufacturers.

 

On the other hand, Mineral red, while also based on iron oxide ranges widely in color from dirty yellow to dark brown... 

 

Randy Hees

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