From the manufacturer:
StarBrite Charcoal Grey is on the darker side of Tommy's StarBrite opaque grey colors which blends flawlessly to create an opaque black and grey tattoo.
This style works great for cover ups when you're not looking to do color, but need the saturation to hide an old tattoo.
On a scale from 1 to 10, this color's intensity is around an 8/9.
It works well as a standalone neutral grey or with others, such as Battleship Grey and Silver Magnolia, or added to others to create a muted tone.
Gauge Size
The gauge size is the circumference of the smaller bar in the middle.