You would definitely need to define "blue". The CB auditor is most likely trying to get your organization to really close a potential gap. If I think something is blue, but it is really light blue...your customer may have an issue. So how does your organization determine what shade of blue is the proper color of blue. My organization has this issue on a regular basis. We make certain that our Engineering team defines the blue color from a Pantone standard. We have our color/resin supplier provide us a with a color chip. From there, we use that color chip that states it is 424C and match up to the actual part that we colored from that resin. This allows us to have a sort of go/no-go gauge with the color determination. We are encouraging the Engineering community to place a range around that color in order for it to make it easier for inspection. Color can be dependent upon who is reviewing the color...the CB auditor is trying to encourage your organization to take the guessing element out of the equation. It would need to be an attribute MSA. You would definitely need to have limits or colors that you would consider to be a "fail". For the MSA, you will need to have non-normals and normals, be able to distinguish between the two...in order to be able to pass the "gage".
