Green Tara illustrates nicely the upsides and downsides of metallic pens.
Depending upon how the light hits them, or how you reproduce them,
the shimmer is highlighted or becomes almost another gold color.
Above, she had gold pen not only where it sparkles, but also all over her crown.

 Seeing the exact same shots side by side also shows the change due to lighting.

That said, I sometimes use them, but try never to have more than one on hand because they are more likely to dry up before I use them up!

Favorite pens, top to bottom:

My favorite pens are Winks of Luna, and I need to purchase the copper-color too.
They are juicy, they have amazing coverage, and unlike the others, they are a brush pen so you can get a little itty-bitty thin line or a fat line and create a wave!
The gold is a very yellow gold, and so I hope I like the color of the copper better.
No toxic smell — in fact, almost no smell at all!  Waterproof in my tests!

I love Pilot metallic markers BUT they are very old school, from the shaking of the ball to mix the inks inside, to the noxious smell which gives me headaches if I use it too long.
However, their gold is a rosy gold which I prefer.  Waterproof in my tests!

Finally, the PITT metallic pens.
They write like a dream, their colors are nicely metallic (the gold is also a yellow gold) but they seem to have little ink in them — in fact,
the level of pen tossing due to loss of ink in
PITT pens in general is what moved me to try a fountain pen again… just so much waste
and dollars spent in plastic.
Waterproof in my tests!

Which brings us to Fountain Pen Shimmering Inks in all their forms.  I admit to not trying many — you need to clean your pens out frequently when using them.  However,
I tried all five of the J. Herbin 1670 series,
and they are gorgeous!  Their ink changes colors as it is watered down — see below —
so you not only have stars-at-night beauty,
but the ink color itself is beautiful.  I ended up buying the green, and may break down and buy the red/hematite as well.  I put them
into a Platinum Preppy 05 pen so they are less likely to clog and if they do, I don’t lose
a pen worth many dollars.  None of the shimmering inks I’ve found are waterproof, which is a big plus to the pens, above.

I leave you with Green Tārā, (Syamatara),
the Buddha of enlightened activity.
Her mantra is “Om tare tuttare ture soha.“

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