Grizzles come in many colors and forms.
Undergrizzle which seems to be a lesser form that doesn't show much grizzle pattern, White Grizzle which is as the name would indicate mostly white and you have Tiger Grizzle which looks like a Grizzle without the grizzle effect in each feather. There is also a form known as Print Grizzle which is the result of the combination of Undergrizzle, Grizzle and Kite bronze on a blue colored bird. Grizzle is a partial dominant with the symbol G. Grizzle which I will refer to here as standard Grizzle removes the pigment from the center shaft outwards. In other words, the birds color is only shown on the outer end tips with the middle being salt and pepper like and the inner most part next to the shaft being white. This combination produces the effect which most fanciers call grizzle.