How to distinguish between ballpoint pens and gel pens?

Ballpoint pen was the term name for oil-based ballpoint pens at the latest before 2005, and is now a general term for neutral ink, water-based, and oil-based ballpoint pens.
Method 1

Smell Most oil-based ballpoint pens have a pungent odor or odor. Aside from scented gel pens, gel pens have almost no odor to the nose. Most gel pens contain an alcohol-like odor.
Method 2

 

Look at the handwriting and the oil-based ballpoint pen tip does not accumulate ink, the handwriting is full of white dots, and the neutral ink ballpoint pen is normally out of water. The handwriting is full and free of burrs

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