Jim... Sorry for mis-speaking. My situation was a little more detailed after speaking with my friend a few minutes ago via text... Allow me the details....
I work in the auto repair field; my friend owns a body shop.
I have a Sky Blue '78 Stingray with some very minor chips. I asked if he could make me some touch up paint for the bike. I gave him the chain guard.
In detail, I learned he used a spectrometer and his Sikkens paint system and found PB-3 to be a match to the chain guard.
Here's where the detail is.....
He mixes and shoots that formula on a test card and compare it to the object. He himself will judge the match and then add/subtract base colors to the formula and reshoot another test card until the color match is perfect. He said he used (4) cards to get it right.
At the time he gave me the paint, he said it was Chrysler PB-3....when he should have said, "I started with PB-3"...
Sorry if I misinformed you. I found that their were some important details to the match that he said he didn't think we're important in general conversation.
In the text, he told me that the color shades will vary, especially on older paints subjected to normal environment and especially candy color which rely on a certain base shade and the thickness of the color coat.
He said if you wanted it exact, you would probably need to color match the color to your specific bike.....
I am unsure what length you'd like to go to match the scratch you describe.
Hope the detail clear this up...