To those who receive such presents from the East, I may just say that this and such like materials gradually undergo a change which gives them on the surface a dull and dead appearance; but they may easily be restored to their original beauty, if the surface be rubbed with a clean cloth or silk handkerchief, so as to polish the little Rugosity or roughness: this will restore the beauty of the colours.
"The Chemical History Of A Candle"
Michael Faraday
In some species this Rugosity is very prominent, and is called the tuberosity of the deltoid; it is prolonged downwards by a border which forms the anterior crest of the musculo-spiral groove and limits this latter in front.
"Artistic Anatomy of Animals"
Édouard Cuyer