Alexei Volkov
The use of tortoise shell for decorative objects and musical instruments has a long history, but due to the decreasing number of turtles and the ban on tortoise shell trade, plastic, celluloid, bone, and horn have become common substitutes. To differentiate between real tortoise shell and plastic imitations, one can look for slight unevenness and fine knife marks from where the shell was carved by hand. Another method is to burn the material—tortoise shell smells like burning hair due to the presence of keratin, while burning plastic emits a strong chemical odour.
| Characteristics | Values |
|---|---|
| Appearance | Tortoise shell has an irregular streaky or spotty pattern that runs all the way through the material. |
| Texture | Tortoise shell may have slight unevenness due to the nature of the shell. It may also have very fine knife marks from where the shell was carved by hand. |
| Sound | Tortoise shell has a different sound when dropped onto a hard surface compared to plastic. |
| Heat Test | Burning tortoise shell smells like burning hair because it is made of keratin. Burning plastic has a chemical smell as it is petroleum-based. |
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What You'll Learn
- Burning tortoise shell smells like burning hair, while burning plastic smells like chemicals
- Real tortoise shell has slight unevenness due to the nature of the shell
- Plastic tortoise shell is usually patterned to look like real shell
- Genuine tortoise shell may show fine knife marks from where the shell was carved
- Plastic is a synthetic material, invented in 1855
Burning tortoise shell smells like burning hair, while burning plastic smells like chemicals
Tortoise shell and plastic are two very different materials with distinct burning smells. Burning tortoise shell smells like burning hair, while burning plastic smells like chemicals. This is an important distinction, as it can help identify the source of a burning smell, which could be critical in preventing a fire.
Burning plastic emits a strong, acrid odour that can be difficult to pinpoint. It is often described as smelling like chemicals. This smell can be caused by various factors, such as faulty electrical wiring, overloaded outlets, or overheating appliances. In any case, it is crucial to act swiftly to prevent a potential fire. If you suspect that the burning plastic smell is coming from an electrical system or appliance, turn off the power source and unplug any associated devices. If the smell persists or you notice smoke or fire, call 911 or your local emergency number.
On the other hand, tortoise shell, which has been used for centuries in decorative arts and fashion, has a distinct burning smell reminiscent of burning hair. This odour is due to the organic nature of the material, which is derived from the shells of turtles. While the use of real tortoise shell is now banned due to ethical concerns, antique items made from tortoise shell may still be encountered. If you suspect an item of being made from tortoise shell, it is important to handle it with care and avoid burning it, as the release of toxic fumes could occur.
The distinct burning smells of tortoise shell and plastic can be used as a means of identification. While it is not recommended to burn either material intentionally, if one is exposed to the burning odour, the knowledge of these distinctive smells can help pinpoint the source and take appropriate action. In the case of burning plastic, swift action can prevent a potential fire, and for tortoise shell, it can ensure the ethical handling of the material.
Additionally, it is worth noting that other materials have been used to imitate tortoise shell, such as cellulose nitrate (celluloid), invented in 1855. These imitation materials may burn differently and produce varying odours, further complicating the identification process. However, the burning hair smell remains a distinctive indicator of potential tortoise shell exposure. This knowledge can empower individuals to make informed decisions when encountering suspicious materials and guide their actions to ensure safety and ethical considerations.
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Real tortoise shell has slight unevenness due to the nature of the shell
One of the key ways to distinguish real tortoise shell from plastic imitation is to look for slight unevenness. Real tortoise shell is naturally uneven due to the shell's organic growth patterns and the way it is carved and shaped. Plastic imitations, on the other hand, tend to have a more uniform and consistent surface.
The slight unevenness in real tortoise shell is a result of the shell's unique structure. Tortoise shells are made up of multiple plates, called scutes, which vary in shape, size, and colour depending on the species of tortoise or turtle. These scutes are arranged in a pattern that gives the shell its characteristic streaky or spotty appearance. However, the specific arrangement of scutes can create subtle variations in the shell's texture and thickness, leading to a slightly uneven surface.
Additionally, the process of crafting items from tortoise shells can also contribute to their uneven nature. Artisans often hand-carve tortoise shells, leaving behind very fine knife marks that can be visible upon close inspection. These knife marks, along with any slight imperfections in the shell's structure, contribute to the overall unevenness of the final product.
To identify real tortoise shell, one can carefully examine the surface for any subtle variations in texture, thickness, or colour. Real tortoise shell may exhibit slight deviations or imperfections that are indicative of its organic origin. However, it is important to note that highly skilled artisans may be able to create plastic imitations with artificial imperfections, making it challenging to distinguish from real tortoise shell.
Therefore, when examining a potential tortoise shell item, it is crucial to look for subtle unevenness while also considering other factors such as the item's origin, the presence of fine knife marks, and the unique streaky or spotty pattern associated with tortoise shells. By combining these observations, one can more confidently determine whether an object is made from real tortoise shell or plastic imitation.
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Plastic tortoise shell is usually patterned to look like real shell
Plastic tortoise shell is designed to mimic the appearance of real shell, but there are several ways to distinguish between the two. Firstly, real tortoise shell may exhibit slight unevenness due to the natural variation in the shell, whereas plastic imitations typically have a uniform surface. Real tortoise shell may also bear fine knife marks from the hand-carving process, which are absent in moulded plastic substitutes.
The patterning of plastic tortoise shell can vary, but it often attempts to replicate the irregular streaky or spotty pattern characteristic of hawksbill turtle shell. This pattern runs throughout the material, and products made from real hawksbill shell will display this consistent patterning. The colour and pattern of real tortoise shell can vary depending on the species of turtle, with the decorative arts term "tortoise" referring to the shells of land turtles, while "turtle" encompasses shells from marine turtle species.
The texture of plastic tortoise shell is typically smooth and consistent, lacking the organic feel of real shell, which has been likened to the texture of thick fingernails. Real shell is also a natural "thermoplastic", meaning it can be shaped by heat and will retain its new shape, a property that modern plastics also possess.
One of the most reliable methods to distinguish between plastic and real tortoise shell is through burning. Burning plastic emits a strong, unpleasant chemical odour due to its petroleum base, whereas real tortoise shell, composed of keratin, produces a milder burning hair scent.
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Genuine tortoise shell may show fine knife marks from where the shell was carved
Genuine tortoise shell is derived from the shell of the hawksbill sea turtle. The shell is a natural thermoplastic, which means it can be heated and reshaped, much like modern plastics. The use of real tortoise shell is now banned in most countries, and it is illegal to sell products made from the shell of the endangered hawksbill sea turtle.
Due to the legal aspects of dealing with tortoise shell, common substitute materials include plastic, celluloid, bone, and horn. However, it can be challenging to distinguish between real tortoise shell and imitation plastic. One way to identify genuine tortoise shell is to look for fine knife marks on the surface, indicating where the shell was carved by hand. These knife marks are typically found on genuine tortoise shell items due to the manual carving process, resulting in slight unevenness that moulded plastic items lack.
The burning test is another method to distinguish between tortoise shell and plastic. Burning plastic emits a strong, unpleasant chemical odour due to its petroleum-based composition. In contrast, tortoise shell, which is made of a substance called keratin, produces only a mild burnt hair smell when burned. However, conducting this test in a market or shop is not feasible.
Some other methods to identify real tortoise shell are observing the pattern and performing a touch test. The hawksbill turtle shell typically has an irregular streaky or spotty pattern that runs throughout the material. Genuine tortoise shell may also have a unique feel, described as similar to a thick fingernail. Additionally, the sound produced when dropped on a hard surface may differ between real tortoise shell and plastic imitation.
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Plastic is a synthetic material, invented in 1855
Plastic is a synthetic material derived from polymers, which are very large molecules made of long chains of atoms. The word "plastic" comes from the Greek "plastikos", meaning moldable. The creation of synthetic materials was revolutionary as it freed people from the social and economic constraints imposed by the scarcity of natural resources.
The first synthetic material used to imitate tortoise shell was cellulose nitrate (celluloid), invented in Birmingham in 1855 by Alexander Parkes. However, the first fully synthetic plastic was Bakelite, invented by Leo Baekeland in 1907. Baekeland had been searching for a synthetic substitute for shellac, a natural electrical insulator, to meet the needs of the rapidly electrifying United States. Bakelite was durable, heat-resistant, and could be moulded into almost any shape, making it ideal for mechanical mass production.
The creation of Bakelite inspired the chemical industry to develop other synthetic plastics. During World War II, the plastics industry in the United States expanded greatly as synthetic materials provided substitutes for scarce natural resources. For example, nylon, invented in 1935, was used during the war for parachutes, ropes, body armour, and helmet liners.
The development of synthetic plastics has continued to evolve, with new plastics being created and finding new uses for existing plastics. The introduction of Bakelite marked the beginning of the Polymer Age, also known as the Age of Plastics.
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Frequently asked questions
Tortoise shell is a natural thermoplastic, meaning it can be shaped with heat. Genuine tortoise shell may have slight unevenness due to the nature of the shell and may have very fine knife marks from where the shell was carved by hand. Plastic imitations will not have these knife marks and will be perfectly smooth. Burning the shell will produce a smell similar to burning hair, while burning plastic will produce an unmistakable chemical smell.
In most countries, the sale of products made from tortoise shell is illegal. It is important to be able to differentiate between the two to avoid purchasing products made from endangered turtles.
Common plastic substitutes for tortoise shell include celluloid, bone, and horn. Cellulose nitrate (celluloid) was the first synthetic material used to imitate tortoise shell and was invented in 1855.
