There Are Pandas, and Then There Are Pandas.
And this isn't either of them! The Pandas we're talking about here, are watches, not bears. And what got me thinking about them (again) was a link posted this morning by @cm.rook who pointed a few of us to the very attractive (and not terribly priced) Yema "Rallygraph" Panda which, in it's most traditional arrangement, looks like the one on the left, but can also be had in the version on the right: The model on the left is a true Panda, while the model on the right is called a reverse Panda. The reason for that distinction is clear--Panda bears, only come in the first arrangement. Now at this point, everyone should be thinking about the most well-know Panda, The Rolex Panda, which is actually a Daytona, and among Rolex Daytonas, the most famous of which is the Paul Newman Daytona, which was famous first, because it was Paul's, and second because it sold at auction for $17.8 million (US Dollars). The story of that auction is well-known so I'll only...
Nov 8, 2019
First problem is, they come bottled ink only. Which means you need to get a converter. That shouldn't be a problem, tho. Second problem *can be* that these are thick, saturated inks. They can be finicky and dry a bit in the nib, leading to hard starting.
Descriptions are here: http://noodlersink.com/noodlers-ink-color/ink-colors-and-their-properties/
That page is eminently searchable.
Another option might be the KWH iron gall inks. The analine dyes might fade, but the tannic-based side shouldn't. It's also good for heavy paper. A downside...it can be finicky too. I find my Pilot Custom Heritage 92's...I have a clear and a blue demonstrator...work superbly with this ink. These are piston fillers, and as demonstrators, seeing the level is trivial. ~ $100-120 on Amazon; the orange versions are a little higher. Presumably more popular.