I mixed more fountain pen ink today to put into 20 ml traveling containers.

By the way, I now have a plastic tray in which I do mixing. Probability of a spill is low, but the impact is catastrophic for my carpet. So based on the potential impact, I use a tray every time to mitigate the risk.

I am testing these bottles because they are cheaper. They seem to be okay. They only have a flat liner in the cap, so we will see if they can hold ink inside or not.

The ones that I have already tested and know work keeping ink inside well are these. These have a cone shaped lid liner inside of the phenolic lid that helps the ink fall back into the jar. Not once have these leaked on me at ground level (have not tested airplane pressure changes yet).

First, I added the glycerin. For 40% glycerin, I needed 4.8 ml. At first I measured from a syringe, but then it was easier on other bottles to mark the fill point with a Sharpie and fill by sight. I use this type of glycerin.

Next, I used the same blue color mix from a previous post.

Then I made a bottle of just black ink with the same glycerin mix and just black ink jet printer ink. It mixed well with the glycerin.

I shook the bottles, carefully at first to test that the cap kept the ink in. It did. Then more vigorously.

And now I have more refill ink. I have not had any problems with the pens.

This seems to be working well enough to continue.