Induction melting process of rePOWDER ultrasonic atomizer can reach temperature up to 1300 °C. To modify low melting point alloys with some of the elements such temperature might be to low or could cause excessive evaporation of material due to it extended overheating. This is another case which was solved by arcMELTER. Our approach was to modify small part of magnesium alloy with high purity silver pellet used typically is casting process for jewelery. This allowed us to prepare a custom master alloy which contained 25 % of silver which could be easily homogenized in the induction melting process in acceptable process temperature. Such approach allows for greater control over the alloying process, enabling researchers to tailor the properties of the alloy for specific applications without the need or ordering large quantities of master alloys for trials but to use pure elements and anything available at their laboratory. Whether for improving the mechanical properties, corrosion resistance, or thermal conductivity, the custom master alloy formed in arcMELTER opens up new possibilities for metals that benefit from precision alloying with critical elements for which master alloys might not be easily available.