Yes it is copper. Sorry about that. Here are some more recipes with their hardnesses in Brinells (HB = Hardness Brinells) the Alloys state the amount of “Master” to use, a specific amount of copper and silver pre-alloyed and meant to be mixed with their respective amount of gold. If you don’t understand something, just ask.
Silver alloys:
Reticulation silver, 80 HB, (800 Ag, 200 Cu):
- 1 gram silver
- 0.25 gram copper
Sterling silver, 60 HB, (925 Ag, 75 Cu):
- 1 gram silver
- 0.081 gram copper
Brittania silver, 52 HB, (958 Ag, 42 Cu):
- 1 gram silver
- 0.041 gram copper
Yellow Gold:
22k Deep Yellow, 60 HB, (917 Au, 49 Ag, 34 Cu):
- 1 gram gold
- 0.09 gram master
18k European Greenish Yellow, 70 HB, (750 Au, 188 Ag, 62 Cu)
- 1 gram gold
- 0.33 gram master
18k Greenish Yellow, 97 HB, (750 Au, 167 Ag, 83 Cu):
- 1 gram gold
- 0.33 gram master
18k Bright Yellow, 120 HB, (750 Au, 125 Ag, 125 Cu):
- 1 gram gold
- 0.33 gram master
18k Reddish Yellow, 125 HB, (750 Au, 83 Ag, 167 Cu):
- 1 gram gold
- 0.33 gram master
14k Greenish Yellow, 130 HB, (585 Au, 280 Ag, 135 Cu):
- 1 gram gold
- 0.709 gram master
14k Medium Yellow, 130 HB (585 Au, 188 Ag, 227 Cu):
- 1 gram gold
- 0.709 gram master
14k Reddish Yellow, 145 HB, (585 Au, 135 Ag, 280 Cu)
- 1 gram gold
- 0.709 gram master
10K Medium Yellow, 110 HB (417 Au, 263 Ag, 320 Cu):
- 1 gram gold
- 1.4 gram master
10k Reddish Yellow, 110 HB, (417 Au, 190 Ag,393 Cu)
- 1 gram gold
- 1.4 gram master
Green Gold:
18k Deep Green, 32 HB, (750 Au, 250 Ag):
- 1 gram gold
- 0.33 gram silver
18K Rich Green, 40 HB, (750 Au, 232 Ag, 18 Cu)
- 1 gram gold
- 0.33 gram master
18k Bright Yellowish Green, 60 HB,(750 Au, 215 Ag, 35 Cu):
- 1 gram gold
- 0.33 gram master
14k Pale Green, 65 HB, (585 Au, 382 Ag, 33 Cu):
- 1 gram gold
- 0.709 gram master
14k bright Yellowish Green, 80 HB, (585 Au, 365 Ag, 50 Cu):
- 1 gram gold
- 0.709 gram master
Rose Gold:
18k orange, 135 HB (750 Au, 250 Cu):
- 1 gram gold
- 0.33 gram copper
18k Peach, 130 HB, (750 Au, 40 Ag, 210 Cu):
- 1 gram gold
- 0.33 gram master
14k orange, 110 HB (585 Au, 90 Ag, 325 Cu):
- 1 gram gold
- 0.709 gram master
14k Red, 80 HB, (585 Au, 415 Cu)
- 1 gram gold
- 0.709 gram copper
10k Red, 60 HB (417 Au, 583 Cu)
- 1 gram gold
- 1.4 gram copper
There are the gold and silver Alloys. Here are the master Alloys. Simply match the master with the alloy (they should have the same name) and get melting.
Master alloys for Yellow Gold:
appear white-ish pink in colour until mixed with gold
22 Deep Yellow Master (600 Ag, 400 Cu)
- 1 gram silver
- 0.65 gram copper
18 European Greenish Yellow Master (752 Ag, 248 Cu):
- 1 gram silver
- 0.33 gram copper
18 Greenish Yellow Master (668 Ag, 332 Cu):
- 1 gram silver
- 0.497 gram copper
18 Bright Yellow Master (500 Ag, 500 Cu):
- 1 gram silver
- 1 gram copper
18 Reddish Yellow Master (332 Ag, 668 Cu):
- 0.497 gram silver
- 1 gram copper
14 Yellow Master (674 Ag, 326 Cu):
- 1 gram silver
- 0.483 gram copper
10-14 Medium Yellow Master (450 Ag 550 Cu):
- 1 gram silver
- 1.2 gram copper
10-14 Reddish Yellow Master (326 Ag, 674 Cu):
- 0.483 gram silver
- 1 gram copper
Master alloys for Rose Gold:
appear red in colour until mixed with gold
18 Peach Master (160 Ag, 840 Cu):
- 1 gram copper
- 0.16 gram silver
14 Orange Master (220 Ag, 780 Cu):
- 1 gram copper
- 0.27 gram silver
Master alloys for Green Gold:
appear white in colour until mixed with gold
18 Rich Green (928 Ag, 72 Cu)
- 1 gram silver
- 0.078 gram copper
18 Bright Yellowish Green master (860 Ag, 140 Cu):
- 1 gram silver
- 0.162 gram copper
14 Pale Green Master (920 Ag, 80 Cu)
- 1 gram silver
- 0.088 gram copper