41. They have been included in many pharmacopoeias, in the older editions in particular, and are specifically referred to as tannic acid . 42. The effect of fuming can be enhanced in non-tannic woods by applying a coat of tannic acid to the surface before fuming. 43. However before it is safe for people to eat, the tannic acid must first be leached out due to its toxic qualities. 44. During World War I, tannic acid dressings were prescribed to treat " burns, whether caused by incendiary bombs, mustard gas or lewisite. 45. Sometimes extracts from chestnut or oak wood are also described as tannic acid but this is an incorrect use of the term. 46. While tannic acid is a specific type of tannin ( plant polyphenol ), the two terms are sometimes ( incorrectly ) used interchangeably. 47. He said when leaf material breaks down, the tannins in the material from trees give off tannic acid , causing things to turn black. 48. The origin of the name is not clear, but it may stem from the natural tannic acid that darkens the water in places. 49. Tannic acid is used worldwide as clarifying agent in alcoholic drinks and as aroma ingredient in both alcoholic and soft drinks or juices.50. Such practices may stem from health benefits such as the ability of clay to absorb plant toxins and protect against toxic alkaloids and tannic acids .
