Purple is the hardest color to match. You can see the original purple and then the natural fade around it. So what do you match ? The original or faded ? If you match the original, you have to do the whole playfield.

I'd say was the playfield, but keep an eye out on any dislodged paint or original varnish. If the playfield start to lose artwork, then something needs to be done.

Thanks for the advice Nino .
I will probably reattempt the touchups on the purple again, ,matching the fade.. which was what I had already attempted  .
I am just showing the stages as I go along .
Cheers
Dave