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Over the last 40 years or so, I have owned a handful of 70 Corvettes with original Bright Blue interiors. I have one now, an all original car, even has the original Mulsanne Blue exterior paint.
My observation has been, that there are two different shades of blue used in the interior of the 70 Bright Blue cars. The kick panels, brake console, steering column, seat backs, rear compartment trim, rear seat belt housings, and the seat covers, (not including the comfort weave panels), are all a slightly darker and more blue color. Except for the seat covers, these are all "hard" items, unlike the dash pad, door panels, shift console, and other "soft" wrapped trim.
I have seen lots of Bright Blue interiors restored, and they look great, but they are all a single color, which is just not right.
If you own a 70 car with an original Bright Blue interior, go out to the garage and take a close look at it and let me know if you agree. If the car has had seat covers replaced or any interior work done, than all bets are off.
the 69 has the bright blue interior, all the other blue interiors including the 70 would be different, a restored 69 bright blue interior does look very nice.
I owned a '68 coupe with Bright Blue interior (in 1974). I bought it from the original owner; no change of interior panels. All the pieces matched very well. It's possible, that over the years, pieces made by different vendors faded at different rates. I've seen 'modest' tint differences in panels on some new 60's/70's Corvettes, but nothing really noticible.
I have noticed similar color differences in my green 71 interior. The interior is completely original. The hard panels (seat backs, rear quarter panels, kick panels, and storage compartment frame are a slightly different shade of green than the soft parts like the door panels and dash. The difference is very slight and only noticeable on certain light.
Slight variations in color is probably common stemming from the manufacturing processes for the individual parts. Vinyl material was dyed as part of the manufacturing process before it got sewn into upholstery sets. Carpet was vat dyed. Hard plastic and metal parts were painted.
There can be visible differences between dyed and painted parts even when the color is supposed to be the same.
Slight variations in color is probably common stemming from the manufacturing processes for the individual parts. Vinyl material was dyed as part of the manufacturing process before it got sewn into upholstery sets. Carpet was vat dyed. Hard plastic and metal parts were painted.
There can be visible differences between dyed and painted parts even when the color is supposed to be the same.
I think this is what I am seeing, the painted parts are a slightly different color than the dyed parts. All the hard parts I mentioned above are painted, as the base material is either metal or a light cream colored plastic. The soft parts appear to have been dyed. The only exception is the seats. The soft vinyl seat covering is the same color as the hard parts, yet the comfort weave insert is the color of the soft parts.
I've got a bright blue interior in my 1970, and I'd say there are slight variations. The most noticeable in mine are the kick panels, they are a shade darker maybe.