Some time ago, I painted a series of oranges; oil on canson paper. Canson paper is generally used for high quality works in color pencil and charcoal. Many Color Pencil Society of America artists use it. It had the acid-free quality I needed for oils. The colors, therefore, are just as strong now as they were a year ago when I painted them. It was also the perfect ground for experimental work since it was inexpensive and very durable.
Google evidently liked them because I had visitors from all over the world look at them, including places like Pretoria and the Brittish Isles. Because there was so much interest in them, I am going to do another series of orange and other citrus fruit images this summer. This time, they will be painted on my new ground of choice; gessoed masonite panel.
Make sure your framer uses only acid free materials.