Sensation, touch hardness

Initial effects of frostbite include uncomfortable sensations of coldness tingling, stinging or aching feeling of the exposed area followed by numbness. Ears, fingers, toes, cheeks, and noses are primarily affected. Frostbitten areas appear white and cold to the touch. Deeper frostbite involves freezing of deeper tissues causing exposed areas to become numb, painless, hard to the touch. 

Many intermediate geometries are possible, which give rise to sensations of sheen and gloss these usually enable one to predict the felt hardness or smoothness of surface without actually touching them. 

Frequently, our response to texture is actually based on a combination of texture and other physical properties. This is especially true with synthetic fibers that come in contact with our skin. These fibers are sometimes woven into fabrics, other times they are simply clumped together, similar to how cotton fibers are clumped into a ball of cotton that you may use to swab your skin. Our sensation of touch involves not just the surface texture of the individual fibers, but the stiffness of each fiber, the material hardness, and how slippery it is. 

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