This sample is Pennonia Napkelte/Sunrise, a fluorescent yellow ink. Sadly, it is a bit disappointing. I had high expectations after liking Napnyugta Sunset so much. Napkelte Sunrise is yellow, but too pale under regular light to be much use. Under UV it’s OK, but the text is even harder to read the way it glows. This one would really only be good for highlighting and drawing.

Scans

The yellow was so pale that it appears to have greatly confused the scanner or software. It not only darkened it, but changed the color completely. I tried scanning it alongside a color reference card but it didn’t make any difference in the output.

Scan of an ink swatch card made from Col-o-ring paper — Swatch Card Scans. Click to enlarge.

Scan of an ink swatch card made from Iroful paper — Swatch Card Scans. Click to enlarge.

I may revisit this in the future to see if I can figure out what happened.

Photos

These photos show each swatch under visible light, a mix of visible and UV light, and UV light alone.

Col-o-ring paper is very reactive to UV and the paper itself glows blue brightly, which makes the glow of the ink appear less intense. Iroful is mildly reactive to UV and glows a little. MD reacts very low so it shows off the glow of the ink the best.

A mix of UV and visible light seems to yield the best results to the eye.

Unfortunately, the ink is barely legible under visible light. It looks interesting under UV, but it’s not all that readable when it glows either. The glow is slightly green as well, not just yellow.

Microscope

Not much of note under magnification either, just pale yellow and a little darkening when a lot of ink pools.

Ink under Magnification. Click to enlarge.

Microscope UV

These photos show magnified portions of each swatch under visible light, a mix of visible and UV light, and UV light alone.

Microscope UV photos are a bit tricky since I have to dial the light up/down on the microscope and add UV light from a flashlight. As the UV light intensifies, it seems to play tricks with the microscope’s camera with the background to some extent.