Science · Level 2 · 171 words

How Paste Joins Torn Paper

Original passage © Studio AM, written for Fluency.

At a paper-repair table, a thin paste can join torn fibers without hiding the page under thick glue. One traditional adhesive begins as wheat starch and water.

When the mixture warms, starch granules absorb water and swell. The cloudy liquid thickens into a smooth paste. A repairer brushes a small amount onto a strip of strong, thin paper and lays it across a tear. The wet paste reaches the tiny spaces among the paper fibers.

As it dries, water leaves the mixture. Starch molecules remain between the overlapping fibers and help hold the two papers together. Because the adhesive is water-based, a trained conservator can often soften it with controlled moisture if a repair later needs to be changed. That possibility is called reversibility.

The useful bond depends on care. Too much paste can stain or stiffen a sheet, and poor storage can spoil the mixture. In skilled hands, wheat starch paste provides a light, strong connection. Its science is quiet: water opens the structure, and drying leaves the adhesive behind.

Comprehension questions

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4 questions
1. What is the passage mainly explaining?

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A. Warmed wheat starch forms a careful, potentially reversible bond as paste enters paper fibers and dries.
The passage traces starch and water through warming, application, and drying, then explains the bond's controlled reversibility and limits.

2. Why does the repairer use only a small amount of paste?

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B. A light application can make the bond while reducing the risk of staining or stiffening the page.
The text says too much paste can stain or stiffen a sheet, while a skilled application provides a light, strong connection.

3. What does “reversibility” mean in this context?

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C. A trained person may later soften and change the repair with controlled moisture.
The sentence before the term describes softening the water-based adhesive under controlled conditions so a later repair can be changed.

4. What leaves the mixture as the paste dries?

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D. Water
The third paragraph begins by stating that water leaves the mixture as it dries, while starch remains between fibers.

Source: Written for Fluency. Original passage © Studio AM, written for Fluency.