I gained entre to our Dulux historic keeper of formulae for an accurate recipe , years ago ; He sat in an oak antique chair at an antique desk with two huge bound books beside him and told me the nearest to him was called GOD ; asked what the bigger one was called ,he replied " MRS GOD ".
Between the two there were several similar recipes , and after an intriguing lecture on how pigment names and chemicals have changed over the years, he convinced me that the originals can only be eye-matched from a hidden patch of original hidden from daylight and humidity , if possible .
I left with the formula for the best Packard Blue I have ever used ; Several coats of PERMANENT GREEN TINTER on a neutral gray or beige prime coat. Try it ! A great T colour .
(Of course Permanent Green may not be the same the world over ..............)
Victor ...Packard 1937 117C sedan , now sadly missed .