<p><b>Tobacco treatment. Part 4</b></p> <p>A LITTLE OF CHEMISTRY</p> <p>Chemical composition of tobacco depends on sort, growth conditions, method and time of cropping and in large extent on soil composition.</p> <p>Just gathered leafs contain 80-90% of water, after drying up in the leafs remain less than 1/3 of water. In two main tobaccos (Virginia, Burley) another 2/3 consist of next components:</p> <p><b>Virginia</b></p> <p>15-25% carbohydrates</p> <p>16% alkaline agents</p> <p>10% different acids</p> <p>10% minerals</p> <p>6% pectin</b> <p>1-3,5% nicotine</p> <p><b>Burley</b></p> <p>20% different acids</p> <p>10% pectin</p> <p>10% tar</p> <p>8% calcium</p> <p>7% nitrogen</p> <p>6% potassium</p> <p>1.5-4.5% nicotine</p> <p>Acidity (PH)</p> <p>Virginia 5.0</p> <p>Burley 5.8</p> <p>But, it is clear, that smoker can be more interested not in content of tobacco leafs but content of tobacco smoke, although, of course, exist direct relation among them.</p> <p>So, according to chemical reaction of the smoke it is possible to talk about two groups:</p> <p>First - alkaline. These are tobaccos Burley and Kentucky.</p> <p>Second - acidic. These are Virginia and Orient.</p> <p>Smoke of alkaline group is dry, is practically free of sweetness and has big content of nicotine.</p> <p>Smoke of acidic group is sweet and has less content of nicotine.</p> <p>Kentucky, accordingly, is stronger, but Orient softer tobacco in their groups.</p>