First, let me get this right out of the way: I don't believe anyone will use a yellow ink in a fountain pen just for writing. On the other hand, yellow inks are very useful for art in general and also for highlighting. Another very popular use is for ink mixing.
Noodler's Yellow is the most basic shade of yellow from the Noodler's brand. They do have other yellows, including ones designed specifically for use in highlighter pens but this one seems to be particularly well suited for mixing. If ink mixing interests you, check out this link which shows a series of Noodler's inks used as CMYK primary colors. The article does an excellent job of illustrating the various shades which can be obtained by mixing these inks to different proportions.
I only bought a sample of Noodler's Yellow and I didn't plan on using it for mixing. As I started typing this article, I got it into my head that maybe I should try at least one combination, seeing that I already possess a whole bottle of Noodler's Navajo Turquoise, which acts as cyan.
I loaded Noodler's Yellow in my Pilot Parallel calligraphy pen with 2.4mm nib. That was the only pen in my collection suitable for such a light colored ink.
The price of a full bottle of Noodler's Yellow is the standard $12.50, or $0.14 per milliliter.
There isn't a lot to say about a yellow ink. This particular specimen is probably the most neutral yellow you can find. It is definitely a warm shade (whatever "warm" can mean in this context) and it doesn't show any shading. For some reason I wrote "Shading: good" in my written review. That should have been "Shading: none" because no matter how many layers of this ink I apply, the color stays flat.
Saturation is high, as it should be.
Drying times are long but that is obviously due to the very wet and wide swath drawn by the 2.4mm broad nib.
Water resistance is non-existent. A few seconds under running water managed to completely obfuscate the text. As a consequence, Noodler's Yellow isn't well suited for applications where water resistance is required.
I have tried using the Pilot Parallel loaded with Noodler's Yellow to highlight text and it depends on the water resistance of that text whether it will smear or not. Bulletproof inks, such as Noodler's Heart of Darkness, won't smear a lot (although it depends how dry the text is). Text from a laser printer or ballpoint pen didn't smear either. The bottom line is that you should think of Noodler's Yellow as being water. If water smears your text, so will this ink.
I'm sure there are a lot more applications for this ink when used for drawing and other types of artistic endeavors. I have used it for a sketch but unfortunately I lacked inspiration and the whole thing lacks punch, but, whatever...
I keep changing my mind whether I should buy a full bottle or not. The thing is, I've already sunk a lot of money in inks which will last me years so I'm a bit reluctant to buy more full bottles. Besides, I have a ton of ink samples that I need to review before diving into ink mixing, because that's the main use I would have for Noodler's Yellow: to experiment by combining it with other inks.
Following are two samples written on photocopier paper and Rhodia 80g paper. Notice that the photocopier paper sample is a bit contaminated at the beginning. It's my fault because previously to Noodler's Yellow I used J Herbin 1670 Rouge Hematite in the Pilot Parallel and it looks like I didn't manage to clean it thoroughly so the result is a little bit of orange.
