Craft · 6 pages · 12 min
Why verdegris is not dirt
The green on copper is a copper salt grown from the metal, not soil sitting on top.
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From the opening
Verdigris is a green or blue-green copper salt, classically copper acetate made when copper, air, and acetic acid such as vinegar meet. The green seen on outdoor copper is a related family of copper corrosion products, and neither kind is dirt that drifted onto the surface. The opening covers acetate green comes from vinegar, outdoor green is copper mineral, and the color is not loose soil.
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Inside
- Acetate green comes from vinegar
- Outdoor green is copper mineral
- The color is not loose soil
- Some green crusts are still active
- Where the idea stops applying
- A distinction worth keeping
Sources
- Copper acetate pigment called verdigris
- Green copper corrosion minerals