Quick Question Are These Coins Bronze? Roman And Greek

Numbering from top left:
1: Known as a "late Roman Bronze", but nominally contained a silver wash.
2: 3rd century antoninianus - likewise a silver-washed debased-silver coin, thoguh higher silver content than number 1.
3: Same as #2, but very, very debased silver.
4: Late-period Egyptian tetradrachm - also theoretically very debased silver, but often with iron, lead and whatever else was sitting around the workshop thrown into the alloy.
5: Greek of some kind. Yes, it's bronze.
6: I have no idea what this is trying to be, but it's not a genuine ancient coin.
7: Jewish Second Revolt. Originals are bronze or brass, this may be a replica.
8: Greek; either a replica or harshly overclened.Greek bronzes generally don't look this brassy.