Plastic fantastic

[Cadmium]

Seriously though, I am very interested in this topic, because I have long looked for material that show yellow and other colors in UV.

This is a very interesting subject.

 

By the way has anyone tried saffron in UV?

[dabateman]

I haven't tried my spices yet. But I do have some left over saffron. I may try it with some fresh turmeric. I have pounds of turmeric and interested now in what the root may look like.

[Cadmium]

I got some saffron, expensive stuff. Have not tried a UV shot with it, it is night time here, and I want to do it in natural sunshine.

I don't know how to make the isopropylene extract, but I will start with a simple shot.

I am not expecting much, because that is usually not the case, but worth trying...

I guess I can always put the left over saffron in my eggs or whatever sometime.

[ulf]

When experimenting with liquid colour-extracts I think that a flat piece of hardened plaster of paris could be a good substrate as it is rather UV-reflective and still porous and absorbent.

[Andy Perrin]

This is just on printer paper (made by Caliber). The dye is blue dye (FD&C blue #1), the lens was the quartz Resolve one, the filter was 330WB80, camera Sony A7S, and it was noontime sunshine with a blue sky. Whitebalance was done in-camera off PTFE.

 

Honestly, the paper looks pretty white to me (after the PTFE WB) -- unless going for scientific reproducibility levels, plaster of paris may be overkill.

 

[ulf]

Honestly, the paper looks pretty white to me (after the PTFE WB) -- unless going for scientific reproducibility levels, plaster of paris may be overkill.

 

Absolutely!

 

For quick testing it is overkill, but if a promising dye is found, plaster of paris might be a convenient material-base for proper colour patches.

It soaks well and have low specularity.

[Andy Perrin]

Same MO as the food coloring test:

The lens was the quartz Resolve one, the filter was 330WB80, camera Sony A7S, and it was noontime sunshine with a blue sky. Whitebalance was done in-camera off PTFE. Exposure was F/16 ISO100 6"

 

Sharpie pens:

 

Top: Bic brite liner highlighters

Bottom: Crayola Take Note! highlighters (these are erasable, and the entries labeled "invisible" are the corresponding eraser inks)