Schlumberger was born in then-German Mulhouse, France, to a well-to-do family involved in textile manufacturing. His father was Paul Albert Edouard Schlumberger (1877-1952) and his mother was Elisabeth Schoen (1884-1942). He had four siblings; Daniel Schlumberger (1904-1972), Pascal Alfred (1911-1986), Isabelle Françoise Elisabeth, and Jacqueline. He sketched constantly during his

The fineness of a precious metal object (coin, bar, jewelry, etc.) represents the weight of fine metal therein, in proportion to the total weight which includes alloying base metals and any impurities. Alloy metals are added to increase the hardness and durability of coins and jewelry, alter colors, decrease the

An acid test is any qualitative chemical or metallurgical assay which uses acid; most commonly, and historically, the use of a strong acid to distinguish gold from base metals. Testing for gold with acid focuses on the fact that gold is a noble metal which is resistant to change by corrosion,