Wash, peel and slice apples crosswise 1/2 inch thick; remove cores and hold in ascorbic-acid solution.
Combine sugar, water, vinegar, cloves, cinnamon candies or sticks, and optional coloring. Boil and simmer 3 minutes.
Drain apples, add to syrup and cook 5 minutes. Pack hot rings and syrup with 1/2-inch headspace.
Process half-pints or pints for 10 minutes at 0–1,000 ft, 15 minutes at 1,001–6,000 ft, or 20 minutes above 6,000 ft.