Behind the proposal is the notion that markets will be more fluid in the long run by revealing relevant corporate information as the ink dries.

FORBES: Confidence Crisis, Business Boon

In July, for example, Chase sent out an offer for an Ink From Chase Cash Business Card that required much less information than earlier offers.

WSJ: Beware That New Credit-Card Offer

Whether they are recording information or simply creating beautiful forms, calligraphers brushes are used to ink five different styles of script, known as seal , official , cursive , running and regular .

UNESCO: Culture

In addition to letting users dedicate different tasks to different screens, Mr Martynov suggested users might want to display important information such as an airline boarding pass or a map on the e-ink screen to take advantage of the fact that the technology only uses power to refresh - and not maintain - its image.

BBC: Yota smartphone