I don't know if there is a Silver ZenKote... If you watch Zen's video he states that when applying ZenKote the color starts out as Gold then as the application continues the other colors develop...
Below is the list from Zen's House of Hybirds website:
ZenKote is currently available in Five rugged finishes:

GunMetal ZenKote: The depth and look of dark nickel, but as tough as nails.

Au ZenKote: The look of 24K Gold but tougher than Titanium . Don't confuse this finish with Gold Plating... it's MUCH more than that!

Sapphire ZenKote: A deep blue finish with incredible wear resistance.

Rose Gold ZenKote: All the luster of rich Rose Gold but with a wear resistance greater than carbide.

Carpathian Blue ZenKote: Available exclusively ay the Zenesis Factory Outlet Store and occasional
vape Meets.
The Sapphire is the hardest one to apply correctly....