Verdigris Roundhead

Verdigris

Verdigris is a common name for any of a variety of somewhat toxic copper salts of acetic acid, which range in colour from green to a bluish-green depending on their chemical composition. Once used as a medicine and pharmaceutical preparation, verdigris occurs naturally, creating a patina on copper, bronze, and brass, and is the main component of a historic green pigment used for artistic purposes from antiquity until the late 20th century, including in easel painting, polychromatic sculptures, and illumination of maps. However, due to its instability, its popularity declined as other green pigments became readily available. The instability of its appearance stems from its hydration level and basicity, which change as the pigment interacts with other materials over time.

Roundhead

The Parliamentarians, commonly called Roundheads by their enemies and in modern historiography, were the supporters of the Parliament of England during the English Civil War (1642–1651). They fought against King Charles I of England and his supporters, known as the Cavaliers or Royalists, who claimed rule by absolute monarchy and the principle of the divine right of kings. The goal of the Roundheads was to give to Parliament the supreme control over executive administration of England.

verdigris

Noun

1. A blue-green patina or rust that forms on copper-containing metals.
2. Copper acetate.

Verb

1. To cover or coat with verdigris.

roundhead

Adjective

1. Having a dome-shaped head.

Noun

1. A roundhead screw, one with a domed head.
2. Alternative letter-case form of Roundhead (“parliament supporter in the English Civil War”)