Cooking and purifying the base. 3 Next, the gum base is cooked in kettles at 243 degrees Fahrenheit (116 degrees Celsius) until it has melted into a thick syrup. To purify it, workers pass it through screens and place it in a high speed centrifuge before refiltering it, this time through finer screens.
Even if you donât use herbicides in your garden, overspray and wind-blown droplets may find their way to your tomato plants. Leaf curl is one sign of herbicide damage. Depending on the herbicide, leaves may tilt down with curled edges to form cupped leaves, or the leaves may pucker and curl.
Leaves, stems, and green unripe fruit of the tomato plant contain small amounts of the toxic alkaloid tomatine. They also contain small amounts of solanine, a toxic alkaloid found in potato leaves and other plants in the nightshade family. Use of tomato leaves in herbal tea has been responsible for at least one death.