Colours of signs and safety
Traffic lights, warnings, lifejackets and road markings.

Black
Carbon black
A deep black pigment and filler made by burning carbon-rich materials with little airPigment
#50C878
Paris Green
A toxic emerald-green pigment once prized in art and used as an early insecticidePigment · 🇩🇪 Germany +4

White
Barium sulfate
A dense, white mineral used in pigments, X-rays, and industryPigment

Red
Lead(II,IV) oxide
A strong red-orange pigment once widely used to protect iron and in illuminated manuscriptsPigment · 🇦🇺 Australia
Photo credits on this page
The small pictures above come from Wikimedia Commons under free licences. Some are cropped to fit.
- Paris Green: Chris goulet at English Wikipedia, CC BY-SA 3.0, source
- Carbon black: FK1954, Public domain, source
- Barium sulfate: de:Benutzer:the-viewer, CC BY-SA 3.0, source
- Lead(II,IV) oxide: BXXXD at German Wikipedia ( Original text: BXXXD ), CC BY-SA 3.0, source