Having a database with more than 20000 coins and its metal composition I would like to have your opinion about this suggestion. I found that coins metal composition not always is the most correct and it seems that there is a lack of information regarding this topic. I hope this can contribute to having more accurante metal composition classification.
Suggestion:
Aluminium: 85-100Al 0Cu
Aluminium-brass: 0.5-8Al 85-90Cu 0Ni 2-15Zn
Aluminium-bronze: 0.5-8Al 85-95Cu 2-6Ni
Aluminium-light-copper: 50-100Al 0.5-49Cu 0Ni (suggestion for some specific coins, ex. Bulgaria's KM# 35 or KM# 36)
Aluminium-heavy-copper: 5-10Al 90-95Cu 0Ni 0Zn (suggestion for some specific coins, ex. Argentina's KM# 40-42)
Billion: 5-49.5Ag
Brass: 0Al 50-90Cu 0Ni 0.5-40Zn
Bronze: 0Al 92-98Cu 0-4Sn 0Ni 0-8Zn
Bronze-nickel: 0Al 85-95Cu 5-12Ni 0Zn
Copper: 99-100Cu
Copper-nckel: 69-85Cu 15-31Ni 0Zn
Gold: 5-100Au
Iron: 95-100Fe
Magnesium: 25Al 75Mg (suggestion for some specific coin: Romania's KM# 153 and KM# 158)
Manganese-brass: 75-90Cu 3-7Mn 6-12Zn (US 1 dollars KM# 310 onwards)
Nickel-brass: 0Al 50-90Cu 0Mn 0.5-10Ni 0.5-40Zn
Nickel-silver: 55-75Cu 11-30Ni 8-26Zn (white coins, different from nickel-brass that are yellow)
Nickel: 99-100Ni
Silver: 50-100Ag
Zinc: 95-100Zn
For cladding or platting coins the suggestion should be applied to the outer composition, adding “clad” or “plated” “specific metal” as already is made.