Epoxy resins are low molecular weight pre-polymers or higher molecular weight polymers which normally contain at least two epoxide groups. The epoxide group is also sometimes referred to as a glycidyl or oxirane group.
Different grape varieties thrive in different climates, but typically do best in U.S. Department of Agriculture plant hardiness zones 5 through 9. Although highly perishable, when stored correctly, grapes can last up to six weeks after harvesting.
Steps. 1  1. Start with fresh green or purple grapes. 2  2. Remove the larger stems from the grapes and wash them thoroughly. 3  3. Place them on a tray.  4. Place them outside in a dry sunny place (this requires warm, dry 1  weather). 5. Let them sit out in the sun for 2-3 days, or until dry (taste test).