The green leaf, after eradication of any foreign matter, is spread on "withering troughs", loosely, to a depth of 6 inches. Fans are installed to pass air over the green leaf while it withers. The object of the withering process is to get rid of the moisture content in the green leaf and prepare the leaf to withstand the strain of rolling without breaking up. Period of withering can vary from 18 to 24 hrs. depending on the moisture content. The leaf, when properly withered, gives off a fragrant odour.