Use cucumbers that are overgrown, even yellowed, huge. Peel 2 gallons of the cucumbers and cut out center seeds. Discard the seeds.
Slice about 1/2 inch thick.
Soak the cucumbers overnight in 2 cups lime, 8 1/2 gallons of water. Use glass container - not metal!
The next day drain the cucumbers and rinse very well.
Put cucumbers In large cooking pan with vinegar, alum and enough water to cover cucumber slices. Simmer 2 hours. Then drain and discard water.
Rinse cucumbers well.
Mix: candy, cinnamon sticks, vinegar, water, sugar and food coloring. Add to cucumbers and bring to a boil.
Stack cucumber slices in sterile canning jars. Fill the jars with the liquid - put the cinnamon sticks in jars, too. Seal jars.
You can do a water bath if you want to.
Wait about three weeks to eat these.