The Color Red - Outdoors
On Sunday, July 14, 2019 at 4:30:15 AM UTC-7, Jim Wilkins wrote:
"whit3rd" wrote in message
...
Other permanent red for walls would be brick, terra-cotta tile, etc.
A pottery studio owner told me that -all- their red inorganic pigments
had been confiscated as hazardous. She did still have high temperature
fire clay and gave me a little.
Probably that's about cadmium red; the duller ochre (Fe2O3) that
gives terra cotta its color, probably is still OK.
Tiles in red are certainly available
https://www.fireclaytile.com/brick/colors/detail/catskill
Red lead (minium) and mercuric (vermilion, cinnabar) pigments aren't modern, but
are also certainly a hazard.
Another heavy metal, gold, colors glass red (might make a glaze of bright
red atop a dull tile background).
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