Impressive light sensitive pigment (Patreon)

Published:

2023-02-18 08:12:12

Imported:

2023-02

Content

After testing the UV detection card I took a look online for the UV sensitive colour changing pigment it used, and found that you can buy it as a bare pigment powder.

I think the rather dramatic warnings on the packet reflect the fact that the supplier I used is clearly aimed at industrial level paint finishes, so the powder is probably safe for mild home project exposure. But don't eat or snort it, or rub it in your eyes.

Even a tiny amount in resin gives a very vivid reaction to UV, as you'll see in the video.

https://www.youtube.com/watch?v=y2fdPznbrXM

Files

Fantastic UV photochromic powder

These amazing pigment powders change from white to a colour when exposed to UV or near-UV light, and then gradually reset to white again afterwards. Even a small amount of pigment in resin has a very distinct effect. The packaging comes with a strong set of warnings including risks of flammable dust, inhalation risks, contact sensitisation and eye damage. Further investigation of MSDS data sheets suggest these may be aimed at high exposure industrial use, but there's no harm taking precautions. The powder consists of the photochromic chemicals microencapsulated for protection when used in things like inks. It's ultra fine, and quite hard to scoop out a controlled portion. Only a small amount is needed in resin to give a vivid colour change, as shown in the video. In the UK I got this from an eBay seller called perfectpearlsandpigments (not a sponsor) who seem to supply exotic pearlescent glitter additives to the specialist paint industry. https://www.ebay.co.uk/itm/253279862369 A quick search shows that the pigment is also available from the usual online suppliers, including unusual photochromic glitter particles for nail-art. The effect is very impressive. A solid change of colour when exposed to wavelengths in the near UV to UVA region (400nm or less). A blue LED did not trigger the effect, but a near-UV one did. The change is also vivid in sunlight which is roughly 3% UVA. If you enjoy these videos you can help support the channel with a dollar for coffee, cookies and random gadgets for disassembly at:- http://www.bigclive.com/coffee.htm This also keeps the channel independent of YouTube's algorithm quirks, allowing it to be a bit more dangerous and naughty. #ElectronicsCreators