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Lisa Frank's line of products—folders, pencil cases, erasers, Trapper Keepers, and notebooks—were very popular, and the company grossed over $60 million a year in sales during its peak in the 1990s. [4] In 1989, the company stopped using the hand-painted airbrushing technique and switched to using computer software. [2]
Erasers may be free-standing blocks (block and wedge eraser), or conical caps that can slip onto the end of a pencil (cap eraser). A barrel or click eraser is a device shaped like a pencil, but instead of being filled with pencil lead, its barrel contains a retractable cylinder of eraser material (most commonly soft vinyl). Many, but not all ...
This polymer sponge works like a pencil eraser. The active ingredient is melamine (a nitrogen-rich organic base) that acts as a mild abrasive, lifting the staining material.
In England, Joseph Priestley, in 1770, observed that a piece of the material was extremely good for rubbing off pencil marks on paper, hence the name "rubber". It slowly made its way around England. In 1764, François Fresnau discovered that turpentine was a rubber solvent.
Microplastics are fragments that can range from less than 0.2 inch (5 millimeters) or about the size of a pencil eraser, to 1 nanometer. A strand of human hair is about 80,000 nanometers wide ...
Animals. Business. Food. Games. Health. Home & Garden. News. Shopping. ... #46 1970’s Pencil Boxes, They Always Broke In A Week, But We Got 1 Every Year ... Image credits: Ambitious-End-1066 #47 ...