New York, G.P. Putnam's Sons, 2nd edition (1st ed., 1865), 266 pp.
Ferguson, A.M. and Ferguson, J. (1888) All About Gold, Gems and Pearls in Ceylon and Southern India. Colombo, London, A.M. and J. Ferguson, 2nd edition, 428 pp.
New York, NY: G.P. Putnam's Sons, 2006. ISBN 0399239987 -- a children's book about salt.
Laszlo, Pierre. Salt: Grain of Life. Arts and traditions of the table. New York: Columbia University Press, 2001.
Gold Plate, Gold Filled, G.P., G.F., Rolled Gold, 1/20 - All of these mean the piece is Plated and the different terms refer to the thickness of the gold plating.
Jewelry Frequently Asked Questions
How can I test pearls and care for them?
Silver, Sterling, R.G.P., Plat, 10%Irid 90%Plat
What is karat gold?
The sheet is them rolled into a very thin sheet and then used to make jewelry or other objects. Jewelry made from rolled gold wear well over time. Rolled gold pieces are marked rolled gold plate, R.G.P., or plaqu? d'or lamin?.
G.P. is used when the method is applied to gold of lesser carat and carat weight. Gold-filled jewelry has a much thicker layer of gold than does gold plate jewelry.
See also: Gold, Color, Stone, Mineral, Make