I’m pretty new to the casting world. Not a jewelry maker, but we are producing parts similar to typically jewelry with fine parts.
We have started working with Yellow Brass (using yellow brass casting chunks from Rio Grande). We wish to use this material as the parts we are producing will need to be soldered by our customers with questionable soldering skills. What we are finding is that the yellow brass tends to really want to stick to the investment, which is a bit of a challenge to remove. We can get it off in an ultrasonic cleaner, but then the finished parts have a pretty poor finish and color. (images below)
The images shown were cast at 1800 degrees in a 950 degree flask using a JR2 induction vacuum casting machine. Wax was steamed for an hour and burned out at 1350 over 3 hours.
Any suggestions as to what can be done to improve the finished casts?