293
3.1.
The primary historical stages of development of
metallurgy………………………………………………..
95
3.2.
Today’s situation of production of noble metals………
98
3.3.
The role of noble metals in the natural economy………
99
Chapter 4.
GOLD, SILVER AND THEIR FEATURES OF THEIR
SIGNS……………………………………………………
102
4.1.
Physical and chemical properties of gold…..……………
102
4.2.
Physical and chemical properties of silver………………
103
Chapter 5.
GOLD
AND
SILVER
EXPLANATIONS
AND
MINERALS………………………………………...……
104
5.1.
Gold Alloys……………………………………………...
104
5.2.
Silver alloys…………………………………………...…
106
5.3.