Basically, it depends on the type of ink, whether it is water-based or solvent type. Mix the paste and metal powder into the binder whenever you use. Just make what you need at the time.
There are two kinds of metallic powder; gold powder and aluminum powder.
Gold power can be used simply by mixing the paste but aluminum power needs to add color.
The glittering degree depends on the particle size of the metal powder mixed (fineness of powder).
The larger particles sparkle more but require rough mesh in order to prevent clogging.
On the other hand, clogging is less likely to occur with the smaller particles even with fine mesh but it will be look less metallic.