Metals: yellow brass vs red brass
Self-tutoring about metals: the tutor looks at brass.
Apparently, red brass is around 88% copper, then 8 to 10% zinc, and 2 to 4% tin. On the other hand, yellow brass is 60 to 70% copper, the rest zinc, with possibly lead and tin in small amounts.
 Robin. “Red Brass vs Yellow Brass: What are the Differences?” rocheindustry.com [Online]. Available at: rocheindustry.com (accessed April 6, 2021).Jack of Oracle Tutoring by Jack and Diane, Campbell River, BC.