We've always had trouble with # 86 because of that muddy olive drab that's hidden in the paint. The special light camera will pop out a different code each time. PPG & Delux had codes many years ago, but modern products flat out refuse to behave like 60 year old cellulose enamels.
Have your mix guyzz eyeball it by 'drop testing' and make sure to judge it only in bright daylight. just sayin'