Translucent red Jinhao 51A after sealing on 5Mar2026

(Please see 

The objectives of this experiment is to determine:

• whether storage of the pen in the vacuum-sealed bag would cause cracking, tearing, or other structural damage to the material of the pen body — at the extreme, I suppose it could explode, if the air pressure differential inside and outside the pen barrel is large enough and the material is fragile enough; and
• whether operationally this would cause or contribute to ink loss from the pen's reservoir, e.g. by the ink being forced out of the converter and splutters, spurts, or leak into either the cap or the barrel cavity, since ink loss is exactly what vacuum-sealing the pen is intended to combat.

The intended duration of the experiment is two to three weeks, during which time the pen will be stored lying sideways and left largely undisturbed in a drawer.