At the same time, to see the wallpaper purchased with lot numbers are the same. Some products even though the same number, but it may exist between different production batches of product color, subtle color at the time of purchase is often difficult to detect, when affixed wall will be found. The lot number on each roll wallpaper, which represents the same color, it should be recognized as the same batch of products to avoid chromatic aberration. Experts calculate the amount of wallpaper introduction, calculated the amount of wallpaper are basically three kinds: one wall area (length × width) calculated by multiplying 1.1 times after the finish; the second is the calculation of the area of ??the walls and the doors and windows are all included heating cover ; third is calculated as three times the floor space. When used in estimating wallpaper room wall, the general area of ??the room with a roll of wallpaper × 3 ÷ = general area of ??the desired number of volumes (generally a roll of wallpaper is 53 cm wide and 10 meters long, with an area of ??5.3 square meters). For security purposes, the required number of volumes in general on the basis of plus 1 volume. In addition, wallpaper and more to sell the entire volume, while the wallpaper has reasonable wear and tear, and therefore should be set aside about 10% of the loss, to avoid phenomena such as color and texture vary when the late replenishment. Tips wood fiber wood fiber wallpaper wallpaper identification of counterfeit goods and more, experts recommend: distinguish between genuine wood fiber wallpaper should be slightly scented wood with other odors from the obviously fake taste; if with fire, wood fiber wallpaper there will be no odor, black smoke, ash white, if it is PVC wallpaper will be black smoke, the pungent smell of burning plastic, ash is black, hard crystals; with water droplets on the back of wallpaper, wood fiber wallpaper permeable good performance, if impermeable or low permeability, it is unlikely that wood fiber wallpaper.