Linen and canvas which do cooler better aca?

Currently on the market there are manufacturers in order to reduce costs and make up for the lack of production technology, a large number of viscose fibers (rayon) instead of linen fibers, or ramie mixed in the flax in order to make a good, and even the production process of scraps - short of flax using dry spinning technology woven into a linen mat, so that the product, although the appearance of the flat and colorful, but quality! Greatly reduced. Some products have more than 70% chemical fiber content, in order to avoid being cheated, there are several ways to identify:

(a) high-quality linen mats clear grain, dense, strong tensile strength, the fabric surface luster is natural and soft, chemical fibers, gloss is too bright.

(b) translucent light irradiation of linen products, you can see the cloud spot, you can also find a small amount of hemp particles.

(c) pure linen products feel smooth, with a sense of weight, hard to hold slightly wrinkled. (d) take a linen fabric yarn, combustion, such as the smell of burning paper, and ash delicate white-gray, it is proved to be hemp fabrics, and chemical fiber combustion, pungent taste, and the combustion products are spherical.