Only use yellow-fleshed peaches when canning because white-fleshed peaches are not acidic enough for canning. This recipe comes from the Ball Canning Back to Basics Book on page 116.
6 Seeds You Can Safely Eat And 6 To Avoid The NCHFP notes that the very light level of syrup — 10% sugar and 90% water — is the closest approximation to the natural sugar levels of fruit.