Do you think it is easy to cast silver in any shape of jewelry? When it come in production, there has to be "Know-how" that make each factory different in capability and variety of design. Today me will reveal some tip and trick that make our manufacturer the leader in silver jewelry field.

First it is about silver premix. Everyone already knows that it has to be more than 92.5% silver in "finished" jewelry. Of course, if we prepare at "exact ratio" before casting, the final may has risk to be lower silver composition than standard, right? Not only from processing loss but from unconsistency distribution of silver component as well. (Do not forget that when customer send jewelry to prove silver content, the standard laboratory like SGS use Fischerscope X-ray to shot laser for finding composition in different areas. So if there is any area on jewelry indicate the fail result of 92.5% silver, so it is false sterling silver also.)

The standard manufacturer like us then has to increase silver content in premix to make final be around 93 - 96% silver to make safe. So you could be more happy when purchase from RAINBOW because it is "almost near pure" silver jewelry (sometime we found it is high up to 98%!) And with high content silver make you jewelry more difficult to be dark also! (When come up with only silver matter, we do not like to say it dark. It like looking gloomy rather, no yo change in black colour. But when it has high content of its alloy metal like copper, the oxidation with exposed air not only make real dark, but can change material colour to look more yellowish also.)

Not just only this, the real secret is to add Zinc as alloyed metal too beside copper. Zinc has special property to make finished jewelry texture more smooth without any bubbles or vague surface problem. Because Zinc's melting point is low than other metal component, it will be evaporated and leave the other alloyed metals shaped together properly. So do not surprise if you find the trace of Zinc in 925 sterling silver jewelry because it is still in industry standard. (The metal that restric to is which can harm human skin like heavy metal as Cadmium, Nickel, and Mercury.)

To be continued in Part 2. It is about casting machine technology!