What are the factors that affect the service life of colored pencils?
Colored pencils are a common drawing tool and they can be used to draw a variety of patterns and colors. However, longevity is an important issue with colored pencils. During use, its service life is affected by many factors. This article will explore the factors that affect the lifespan of colored pencils.
1. Lead hardness
The lead hardness of colored pencils is an important factor...
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