Answer :
Final answer:
A tube may darken over time due to a process called oxidation, which happens when materials, such as metals, are exposed to air and moisture. Dirt can also accumulate on the tube, causing it to look dirty and discolored.
Explanation:
A tube that has been in storage or on the job site for a lengthy period may darken due to
oxidation
. Oxidation is a natural process that occurs when materials like metal are exposed to air and moisture over time. The tube may also accumulate
dirt
from the environment, which can leave it looking dull and discolored. For example, if a copper tube is left outside, it can oxidize and darken, and it might collect dust, soil, and grime from the environment. These factors can cause the tube to darken and look dirty.
Learn more about Oxidation and Dirt Accumulation here:
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