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Gel pen gel ink refill grease at the end of what?

Gel pen refill grease at the end of neutral lithium ester oil, its role is as follows:

To maintain good moisture sealed to prevent overflow ink evaporates or turn the clock back.

Gel ink pen writing, lithium acetate could follow at any time like a piston, ink using atmospheric pressure press down, neutral pen writes smoothly, until the ink out.