Q 01/05

What is glass traditionally coloured with to make stained glass?

A) Vegetable dyes soaked in

B) Enamel sprayed on the surface

C) Metallic salts added during manufacture

D) Coloured paper laminated on

Answer · why

C) Metallic salts added during manufacture

Different metal oxides give the different colours, from greens and blues to wine red.

Q 02/05

What are the metal strips that traditionally hold stained-glass pieces together called?

A) Ferramenta

B) Tracery

C) Cames

D) Mullions

Answer · why

C) Cames

They have an H-shaped section; modern makers sometimes use a thin metal foil instead.

Q 03/05

Which metal is used to make the strips that join the glass in a traditional window?

A) Copper

B) Lead

C) Iron

D) Tin

Answer · why

B) Lead

Joints are soldered, and a soft oily cement is forced between glass and metal to weatherproof the panel.

Q 04/05

Which metallic oxide produces the deep blue of medieval glass, famous at one great French cathedral?

A) Copper

B) Cobalt

C) Manganese

D) Nickel

Answer · why

B) Cobalt

Concentrations of only 0.025 to 0.1 percent in soda-lime glass are enough for that brilliant blue.

Q 05/05

Which precious metal, in tiny concentrations, produces rich ruby-red glass?

A) Gold

B) Palladium

C) Platinum

D) Silver

Answer · why

A) Gold

Around 0.001 percent does it; even less gives the paler pink sold as cranberry glass.