Hi everyone, I've recently bought two 50ml Iroshizuku Inks from my trip to Japan. One is a Tsuki-yo and the other is a Kon-Peki These are beautiful inks but I noticed a level? depth? difference in the two bottles. The Tsuki-Yo seems ink seems to go deeper into the bottle than the Kon Peki. I am suspecting this must be due to the refraction of the light differing slightly from the glass form of the ink bottles. Which means the two bottles have a different inner shape and not an actual ink capacity difference. Has anyone ever noticed this before? I'm pretty sure its just the bottles differing in shape, and that both are legitimately 50ml, but anyways... would like to here a more experienced opinion!