Education/demonstration model - wooden box filled with examples of chalk - 1900-1910 - presentation chalk
04
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Selected by Jonas Rathaj
Has worked with taxidermy since childhood and gained retailer experience.
Estimate € 140 - € 170
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Antique presentation box for Kalk with specimens of Kalk and calcium compounds (e.g., calcium oxide, calcium hydroxide, calcium carbonate) dating to 1900–1910, in a wooden case 50 cm high, 40 cm wide, 3 cm deep, weight 2 kg, one tube missing.
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Description from the seller
An antique presentation box probably used for educational purposes at school.
a very special collection of all chalk types
in various forms, including solid and also in powder form
Unfortunately, one small tube is missing.
Nevertheless, a very special and beautiful object.
that every collector would like to have.
Lime is the term for a number of alkaline salts of calcium, such as calcium oxide (also known as quicklime), calcium hydroxide (slaked lime), calcium carbonate, and calcium hydrogen carbonate.
In nature, lime occurs as calcium carbonate in substances such as limestone and marl. Living organisms also possess parts that contain a lot of lime, such as bones, shells, and armor of creatures like corals. Limestone is formed from lime-rich remains of dead sea creatures. Lime-like products are obtained from limestone, shells, and bones.
Next to this, lime, in the form of calcium hydroxide (Ca(OH)2), is widely used as a binding and/or whitening agent. The limestone chunks (or shells) are burned in a lime kiln to produce CaO (quicklime), which, when water is added (slaking), turns into calcium hydroxide (slaked lime), releasing a significant amount of heat. This calcium hydroxide can harden by absorbing CO2 from the air. Slaking can be done by adding excess water (wet slaking) or by adding a limited amount of water (dry slaking). In dry slaking, the process is slowed down, and the heat generated is used to evaporate any excess water, resulting in a dry lime powder. Wet slaking produces lime milk, which is poured into a pit. Excess water drains into the ground, leaving behind a dough-like mass that, if properly covered, remains durable for a very long time. Lime putty is produced by storing the slaked lime for a long period with excess water. This process is called 'putting it in the rot.' It results in a fine type of lime dough suitable for high-quality applications.
The object is carefully packaged and shipped.
An antique presentation box probably used for educational purposes at school.
a very special collection of all chalk types
in various forms, including solid and also in powder form
Unfortunately, one small tube is missing.
Nevertheless, a very special and beautiful object.
that every collector would like to have.
Lime is the term for a number of alkaline salts of calcium, such as calcium oxide (also known as quicklime), calcium hydroxide (slaked lime), calcium carbonate, and calcium hydrogen carbonate.
In nature, lime occurs as calcium carbonate in substances such as limestone and marl. Living organisms also possess parts that contain a lot of lime, such as bones, shells, and armor of creatures like corals. Limestone is formed from lime-rich remains of dead sea creatures. Lime-like products are obtained from limestone, shells, and bones.
Next to this, lime, in the form of calcium hydroxide (Ca(OH)2), is widely used as a binding and/or whitening agent. The limestone chunks (or shells) are burned in a lime kiln to produce CaO (quicklime), which, when water is added (slaking), turns into calcium hydroxide (slaked lime), releasing a significant amount of heat. This calcium hydroxide can harden by absorbing CO2 from the air. Slaking can be done by adding excess water (wet slaking) or by adding a limited amount of water (dry slaking). In dry slaking, the process is slowed down, and the heat generated is used to evaporate any excess water, resulting in a dry lime powder. Wet slaking produces lime milk, which is poured into a pit. Excess water drains into the ground, leaving behind a dough-like mass that, if properly covered, remains durable for a very long time. Lime putty is produced by storing the slaked lime for a long period with excess water. This process is called 'putting it in the rot.' It results in a fine type of lime dough suitable for high-quality applications.
The object is carefully packaged and shipped.
Details
Era
1900-2000
Style subtype
Arts & Crafts
Title additional information
presentation chalk
No. of items
1
Material
wooden box filled with examples of chalk
Style
Antique
Condition
Fair condition - heavily used & with possibly minor parts missing
Height
50 cm
Weight
2 kg
Depth
3 cm
Width
40 cm
Estimated Period
1900-1910
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