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Recycling codes are used to identify the materials out of which the item is made, to facilitate easier recycling process. The presence on an item of a recycling code, a chasing arrows logo, or a resin code , is not an automatic indicator that a material is recyclable; it is an explanation of what the item is made of.
African-American hair comes in a range of textures, but the most common hair type is curly with lots of volume. [5] This curly quality is the product of the shape of the hair follicles . [ 5 ] More circular-shaped follicles cause hair to grow straighter, while more curly hair is caused by more elongated, oval-shaped hair follicles. [ 5 ]
The production of silk originated in China in the Neolithic period, although it would eventually reach other places of the world (Yangshao culture, 4th millennium BC). Silk production remained confined to China until the Silk Road opened at some point during the latter part of the 1st millennium BC, though China maintained its virtual monopoly over silk production for another thousand years.