Snapped this earlier when I had the bottle out to fill a pen. Most inks are so opaque you can't see much going on in the bottle, but Diamine Sunshine Yellow is very much the opposite. To-ro is similar.
Do not drink the yummy-looking punch.
I kinda cheated with this photo a little with some added backlight, but I was trying to capture how the bottle looks naturally and the camera just wasn't cooperating.

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