Ethan Clarke
There are several ways to identify whether an object is made of bone or plastic. One way is to examine the object under a magnifying lens or microscope to look for pores, which indicate that the object is likely made of bone. Another method is to assess the weight of the object; ivory and some types of bone are typically heavier and denser than plastic. A third way is to test the object's reaction to heat by using a hot needle or running it under hot water. Plastic will melt, whereas bone will produce a burning smell.
| Characteristics | Values |
|---|---|
| Appearance | Bone has a natural appearance with some variation. Plastic has a uniform colour. |
| Texture | Bone has pores and cracks on its surface. Plastic has a smooth texture. |
| Weight | Bone is dense and heavy. Plastic is lightweight. |
| Smell | Bone has a distinctive odour. Plastic has a subtle smell when burnt. |
| Reaction to heat | Bone burns and smells like burnt hair. Plastic melts when heated. |
| Sound | Bone and plastic sound different when tapped against something hard. |
| Feel | Bone feels different from plastic when scratched with a fingernail. |
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What You'll Learn
Use a magnifying glass to look for pores and lines
When distinguishing between bone and plastic, one of the most effective methods is to use a magnifying glass to examine the presence of pores and lines. Bone, being a natural material, will exhibit variation under close inspection. Plastic, on the other hand, tends to have a more uniform appearance.
To begin, place the object on a flat surface and use a handheld magnifying glass to closely examine its surface. Adjust the distance between the magnifying glass and the object until the details come into focus. Pay attention to the presence of pores or lines, which can be indicative of the material's composition.
Pores, which are indicative of bone, will appear as very small dots or holes covering the surface. These pores are a result of the fine blood vessels that supply bone with nutrients. Plastic, being a synthetic material, will not exhibit these pores.
In contrast, if the object's surface is covered in lines, it is more likely to be made of ivory, a type of bone with a distinct grain pattern. These lines can appear in various ways, including straight, cross-hatched, or in a circular motion. Ivory is known for its Schreger lines, which are commonly referred to as cross-hatchings, engine turnings, or stacked chevrons.
It is important to note that some plastics may be designed to mimic the appearance of bone, so examining other factors such as weight, colour variation, and feel can also be helpful in making a definitive determination between bone and plastic.
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Assess the weight of the object
When trying to identify whether an object is made of bone or plastic, assessing its weight can be a helpful indicator. Bone and ivory can be similar in weight, but ivory tends to be of higher value and more regulated than bone. Both bone and ivory are heavy and dense, comparable to a similarly-sized billiard ball. If the object feels lightweight, it is likely not ivory, but it could still be bone.
To further differentiate between bone and plastic, you can examine the object's surface texture and appearance. Bone is a natural material that will have some variation, while most plastic items will have a uniform colour and texture. Plastic will often have manufacturing marks, such as seams, holes, or indentation marks, whereas bone is typically made through subtractive manufacturing, resulting in a lack of production holes or indentations. Additionally, bone may exhibit inconsistent grain lines and mineral lines, giving it a less smooth appearance compared to plastic.
Another distinguishing factor is the presence of pores. Bone is a porous material, so you may observe very small dots or holes covering its surface when examined under a magnifying lens. In contrast, ivory exhibits smooth lines rather than pores.
While assessing the weight of the object is a useful indicator, it is essential to combine this evaluation with other distinguishing characteristics, such as texture, appearance, and porosity, to make a more accurate determination between bone and plastic.
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Sand the object in an inconspicuous spot
Sanding an object in an inconspicuous spot is a good way to identify whether it is made of bone or plastic. This method is particularly useful when trying to identify guitar saddles, knife handles, or beads.
Sanding the object will help you identify the material in two ways. Firstly, bone will smell like bone, and plastic will not have much of an odour. Sanding off a small amount of the material will release this odour, and you can identify the substance accordingly. Secondly, bone is a hard material, and a fingernail will skate across it without leaving a mark. Plastic, on the other hand, is softer, and a fingernail will leave a mark.
It is important to sand only a small, inconspicuous area of the object, as this method can reduce the value of the item. Sanding a small area will also help preserve the structural integrity of the object.
Other methods to identify bone versus plastic include using a hot needle or pin to melt the material. Plastic will melt, whereas bone will burn but not melt. However, this method can damage the object, so it is best to use an inconspicuous area. Another method is to tap the object against something hard. Bone and plastic will sound different.
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Examine the object's uniformity
Examining the uniformity of an object can help determine whether it is made of bone or plastic. Bone is a natural material and will have some variation, whereas plastic items will usually have a uniform colour. Bone chips, for example, often have short, dark cracks in the surface, caused by soiling. These cracks tend to run in the same direction and may be hard to spot.
Plastic items will also usually have seams, although these may be very subtle. Older hard plastics like Bakelite, however, will not have seams. If you run a plastic object under hot water, it may give off a chemical odour, indicating that it is Bakelite.
Another way to test for Bakelite is to apply Formula 409 (a cleaning agent) to a small area with a Q-tip; if the plastic is Bakelite, it will turn orange. Bone, on the other hand, may smell natural, almost like a mud mask. When rubbed dry with a cloth, bone will absorb some of the water, whereas plastic will not.
A further test to determine whether an object is bone or plastic is to use a non-permanent marker. The ink will likely be absorbed by bone but will wipe off plastic.
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Test the object with a hot needle
The hot needle test is a commonly used method to identify plastic. It involves probing the object with a hot needle to observe its physical melt or deformation behaviour. This test is especially useful when trying to distinguish between bone and plastic.
Firstly, it is important to note that this test should be used as a last resort, as it is destructive in nature and can damage the object being tested. If you are testing an antique or an object of value, it is recommended to use non-invasive tests first.
To perform the hot needle test, heat up a needle and place it on a non-critical area of the object. Observe the reaction - if you get a nasty burning smell, it is likely bone. If the object melts, it is plastic.
It is important to note that this test may not always be accurate, especially with smaller microfibers or certain materials like cellulose acetate. The accuracy of the test depends on various factors, including the molecular weight, crystallinity, and composition of the polymer.
To increase the accuracy of the test, it is recommended to use detailed criteria and compare the results against known standards of target plastics and background materials. Spectroscopic verification can also be used for higher confidence in the results.
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Frequently asked questions
Bone is a natural material and will have some variation. Plastic items, on the other hand, will usually have seams and a uniform colour. You can also look at the item under a microscope or a magnifying glass to check for pores, which indicate that the item is made of bone.
Bone has a different feel from plastic. If you tap a bone item against something hard or your teeth, it will make a different sound from plastic.
Bone has a natural, earthy smell, almost like a mud mask. Plastic, on the other hand, will not have much of an odour. If you sand an item made of bone, it will smell like burnt hair.
If you heat up a needle and place it on a non-critical area of the item, you can identify its material based on the result. If the item melts, it is plastic. If it gives off a nasty burning smell, it is bone.
If you wash an item made of bone, it will absorb some of the water. Plastic, on the other hand, will not absorb water.
