Inferno:
That's normal.
"Blue" chromates are really supposed to be clear. Some manufacturers describe them as "blue (clear)" or "clear (blue)".
The word "blue" is used to describe them because the majority of them all impart an unavoidable blue tint, to a lesser or greater degree, depending on which formula of chromate you're using.
Caswells blue is VERY subtle (I like it). Unless you can compare it to a part done w/bright zinc w/out blue chromate, you'd never know.
Here's a photo of some examples:
Bolt at far left is done in "brand X" - the blue is quite evident
Bolt at 2nd from left is Caswell blue - not nearly as noticeable
2 bolts at right are in a true clear
Notice how the Caswell bolt is slightly more blue that the last 2
Sean