| Term |
Definition |
| Natural Materials |
They are all products or physical matter from plants, animals or soil. The minerals and metals which can be extracted from them (without any modification) are also placed in this category. |
| Natural Polymers |
They are defined as materials that widely occur in nature and/or which can be extracted from plants and animals. Some examples of natural polymers are cellulose, silk, natural rubber as well as other materials. |
| Nubuck |
It is also known as buffed leather. It is a leather that has had the top surface buffed to produce a soft velvet-like touch. Depending on the depth of the buffing there will often be a clearly visible nap. |