Mateneh Idris
The study of condensed tannins is among the oldest styles of chemistry famed. The origin of the word phenol springs from the apply that these compounds were employed in the animal skin trade. This trade has created use of tannins for hundreds of years. Tanning could be a method whereby dried animal skins are fashioned into animal skin by its contact with a copiousness of tannins. Within the Northern latitudes the foremost common phenol used was oak bark. The explanation for this was the big expanse of oaks that were a typical feature of all northern European countries within the past. This method had been dispensed for generations however the science behind the growth of animal skin chemistry was born out of the commercial Revolution. For the primary time animal skin was being made for over personal use and also the age of production had arrived throughout the evolution of this chemistry there are several pioneers WHO have gained a data of the advanced chemical processes concerned in tanning. The attainment of this information passed considerably on a trial-and-error basis. Consequently, there are several definitions that have tried to encapsulate verity essence of what defines a phenol. A general description used defines a phenol as everything extracted from a plant that offers a blue color on exposure to ferrous chloride. Haslam in his book on Plant Polyphenols prefers the definition coined by Bate-Smith and boyfriend, they projected that tannins were "water soluble phenoplast compounds having molecular weights between five hundred and three, 000 units which besides giving the same old phenoplast reactions, they need special properties, such as, the power to precipitate alkaloids, scleroprotein and alternative proteins."
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