Mix lime and water; pour over cucumbers and let soak for 24 hours. Drain and rinse.
Bring 1 cup vinegar, food coloring and alum to a boil with cucumbers.
Simmer for 2 hours. Drain and place rings in large container.
Make syrup of sugar, cinnamon, red hots, 2 cup vinegar and 2 cups water.
Bring to boil; pour over rings and let stand overnight.
Pack rings in jars. Reheat syrup to boil. Pour over rings to mouth of jars.
Process in water bath for 5 minutes to seal.
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