So I had enough Rainier cherries to make canned Maraschino cherries. I was looking up how to can sweet cherries in one of my favorite books, The Encyclopedia of Country Living by Carla Emery and found this recipe too
Per google , Rainiers are a good substitute for Royal Anns. I made notes about how to make limewater which I also figured out with the help of google. I ran out of red food coloring so I used some purple and pink too. These will be colorful cherries. The syrup tastes good so hopefully the cherries will too.
PS I still LOVE this book. I found my first one in a Berkeley bookstore in the 1990s. The one I use now is an updated version with improved canning techniques. I bought a collection of the original mimeographs that she used later to write the book. I should look through these to find the origins of this recipe. I love how she saved old homesteading techniques before they were lost. Sadly she has died but her good work lives on.