The dull zinc appears to be zinc without ANY passivation.
IF not mistaken the bright shiny bluish looking tone is due to "clear or blue" passivation, Which BTW is the least durable of the passivated zinc.
Olive is the most durable,
Black and gold are in the middle...
Blue or clear is least durable
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~JAG~
NCRS#65120
68 GTO HO 4 spd Alpine Blue /Parchment 2 owner car
#21783 71 Corvette LT1 45k miles Orig paint - Brandshatch Green - National Top Flight - last known 71 LT1 built.
71 Corvette LT1 42k miles Original paint - Black - black leather - only black LT1 known to exist.
NUMEROUS Lemans blue Camaros,
Monza Red and Daytona Yellow Corvettes
& a Chevelle or two...
Survivors, restored cars, & other photos
https://picasaweb.google.com/lh/myphotos
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