Write a guide. For many people, it is easy to tell if your Ray-Ban sunglasses have polarized lenses, but some people are unsure and want to know for certain. There are two ways to tell: first, it could be written on the inside of the ear band, and, second, you can look on the top corner of the lenses.
toxins in food. in nutritional disease: Toxins in foods. A greenish tinge on potatoes, although merely the harmless substance chlorophyll, indicates that the natural toxicant solanine may be present. Solanine builds up when a potato is handled roughly, exposed to light or extremes of temperature, or is old.
Potatoes (Solanum tuberosum) originated in the Andes mountains, South America, about 7,000 years ago. In about 1570 the tuber made its way to Europe, but was thought to be poisonous as it is a member of the Nightshade family.