I've got a 1982-ish Olmo Competition....



... but it has seen a bit of abuse over the years. The top tube has a bit of corrosion that I periodically try to slow down.

I've gone to the local auto paint supply store for touch-up paint, and they generally do a great job at figuring out how to mix up a batch of the correct color. However, "candy" paint jobs are a special challenge. My Olmo has a gold base layer, with a layer of tinted clear lacquer on top. There's no way to make a plain, single layer paint look the same, but hopefully you can get in the ballpark.

The last time I had them make a bottle of touch-up paint, they came back with a Nissan color...




The paint looked like a great match in the store, which is about all you can hope for.
I was fixing up a spot on the top tube, so I sanded it and applied some gray primer.
After brushing the paint on, it became obvious that it was too dark.




At the recommendation of a friend, I tried a Testors red paint with some gold mixed in, and the results were closer....




That's my low skill attempt to fix up my red Olmo. It's probably not the answer you need, but perhaps will help keep you from making the same mistakes.

Steve in Peoria