Some peculiar materials of eyeglass frames

Eyeglass frames have developed over a long period of time, during which the many characteristics of special materials of eyeglass frames appeared briefly and then slowly withdrew from the stage of history for various reasons; today, we will learn about them.
Tortoiseshell glasses frame
The Hawksbill turtle is a species similar to sea turtles. The tortoise shell has always been a relatively common natural material for making eyeglass frames. But with the slow scarcity of this species, tortoiseshell is a protected animal, and now there are no manufacturers or companies in production; most of the market are imitations or old models that have been around for a long time.
The structure of the tortoiseshell is close to human nails and hair, and it is the closest to the skin, so it does not cause skin allergy and is not very slippery when sweating. And it is hard and not easily deformed, so in those days, it also belonged as the top material for making eyeglasses.

However, compared with modern materials, tortoiseshell frames are relatively heavy, hard, and easy to dry and crack. The usual maintenance requires frequent wiping with special ointment, and it usually needs to be kept in water. The later adjustment is also very difficult, so tortoiseshell frames are not comfortable to wear, and the only advantage is that their natural color is very beautiful. Hence, the collection value of tortoiseshell frames is much more than the practical value.
In addition to such amazing natural materials as tortoiseshell glasses, there are actually many natural materials that have also been made into glasses: 

Horny material eyeglass frames
People used to use the horns or skins of animals such as cows and sheep to make frames, and like tortoiseshell, they are now very rare. The characteristics of horn material are similar to those of tortoiseshell because it is keratin, so it is not irritating to the skin, but it is difficult and costly to make by hand. Other properties are slightly inferior to the tortoiseshell frame, but it is relatively inexpensive. At present, most of the horn rimmed glasses that can be found on the market are made of artificial materials, generally using acetate and plastic, and these materials are easier to process.

Wooden eyeglass frames
Wooden eyeglass frames are relatively heavy but not easy to be exposed to ultraviolet light and discoloration. Hardness and light selectivity are also relatively good ones, with high-temperature resistance, so they wear a long time and do not have to worry about deformation and other phenomena, but the same, once the deformation, it is difficult to adjust back. Wooden eyeglass frames also belong from natural materials, some eyeglass frames will use high-grade precious wood as accessories, such as mahogany, pearwood, etc., which are relatively rare special wood, so some wooden eyeglass frames are very expensive. All-wood frames in order to ensure the strength of the frame, the lines are more rugged, the decorative effect is better, and they are more suitable for fashionable and trendy young men and women.Some peculiar materials of eyeglass frames