Yarnall Abbott study of paris bookstalls, egg tempera on black paper. (behind glass..snapshot)
Web info about Yarnall Abbott
Elenore Abbott plein air painting egg tempera on black paper, Mexico

Very poor snapshot of Elenore Abbott Mexico study under glass.
This is egg tempera on black paper.
http://www.fairies-fantasy-art.com/elenore-abbot-american-illustrator.html
This is egg tempera on black paper.
http://www.fairies-fantasy-art.com/elenore-abbot-american-illustrator.html