For example, iron-gall ink, commonly used on ancient documents, is transparent to infra-red light and most visible in the ultraviolet region of the spectrum.

ECONOMIST: Monitor

It will have to be an insulator and to be transparent to the relevant laser light.

ECONOMIST: An old thought experiment may soon be realised

Think of it as a sheet of chicken-wire that is just a single atom thick, but also lightweight, strong, airtight, stretchable, transparent and an excellent conductor of both electricity and light.

FORBES: Silicon Chips May Have Quite A Bright Future, Says Nobel Prize Winner

This negative is illuminated from the front by an arc lamp, and the light from this lamp passes through the transparent regions of the liquid-crystal layer to the middle layer.

ECONOMIST: Curtains for celluloid