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Dark blue Dark  bright blue Medium bright blue Light bright blue Light blue
Note:  Lavender overtones are desired however that doesn't mean a purple or pink cat.  Lavender is toward the purple spectrum of blue while remaining blue.  And paler shades preferred doesn't not mean absence of blue.  Absence of blue results in a flat silver which is also an incorrect shade.  The silver appearance should come from the contrast of the tips against the blue base coat NOT from the absence of blue in the base coat.

Lavender Overtones (Desirable)

Flat Silver (Undesirable)

 
Registering Organization Points Description
ACFA 20
Color
Color: Even, bright blue throughout with lighter, lavender color preferred. Guard hairs silver tipped giving coat lustrous appearance. No white. Ghost tabby markings permitted on kittens.
CCA 20
Color
The colour should be an even bright blue throughout.  Lighter lavender colour is preferred.  Guard hairs shade to a silvery blue tip giving the coat its lustrous appearance.  No white is permissible.

Colour Description:  Blue:  Silver blue overall without shading or tabby markings, but with the appearance of silver tipping at maturity. 

CFA 20
Color
Color: Even bright blue throughout. Lighter shades of blue preferred. Guard hairs distinctly silver-tipped giving the cat a silvery sheen or lustrous appearance. A definite contrast should be noted between ground color and tipping. Free from tabby markings.
FIFe 10
Color
Blue-grey coat, even and clear, with a distinct silver sheen. Medium blue-grey with a silver sheen preferred. 
Faults:  Tabby markings, bars or shading ("ghostmarkings")
GCCF 15
Color
Colour - Clear blue and even throughout with a distinct silvery sheen. Medium blue is preferred. The coat must be blue to the roots, which may be fractionally lighter in tone, and the hairs must show no banding or silver tipping although there may be absence of pigment at the tip. In maturity the coat should be free from tabby markings or shading, although ghost markings may show in kittens.
TICA 20
Color
Color: Even bright blue throughout.  Deeper tipping preferred making the cat appear lighter in color.  Guard hairs tipped with silver, with deeper tipping preferred.  This silver tipping is not due to the action of the Inhibitor (silver) gene.  Ghost tabby markings permitted on kittens.

General Description: Of a medium blue color with silver tipping of the guard hairs, the coat reflects light, giving a silvery sheen to the fur.  Silver-tipped guard hairs should contrast against solid blue ground color when hair is stroked against the grain.  The coat is an even bright blue throughout, with deeper tipping preferred making the cat appear lighter in color.