AskPippa, to Hair
@AskPippa@c.im avatar

Did you know that white can sometimes revert back to having colour? This article talks about research in why hairs can change colour.
But my thought is -- they looked just at people. If you look at the hairs on your patterned dog or cat you'll find individual strands of hair that are multiple colours -- from top to bottom. I had a tabby whose stripes that were dark on the surface, were lighter in the middle and almost white at the root. I guess that means that can travel through hair? (I'm guessing, I haven't actually seen the research).
https://getpocket.com/explore/item/gray-hair-can-return-to-its-original-color-and-stress-is-involved-of-course

kevinbowen, to chemistry
@kevinbowen@fosstodon.org avatar

"The invention of blue and purple pigments in ancient times"

A chemical & historical analysis of "Egyptian and Chinese copper-based pigments"

Section 2 contains most of the (if you wish to skip over the technical details).

Section 3. Examined Objects provides specific examples from Egyptian & Chinese

Section 5. The dissemination of the blue pigments and technology transfer

https://pubs.rsc.org/en/content/articlehtml/2007/cs/b606268g

RadicalAnthro, to art
@RadicalAnthro@c.im avatar

The first was art...
Here a review based in (S ) evidence on the origin of personal ornamentation is presented.

  • marine gastropods from Blombos Cave dated to between 100 ka and 70 ka.
  • Unperforated and naturally perforated shells were collected between 100 and 73 ka.
  • previously unrecorded gastropod species was used as bead 70 ka.

The team does not think the authors (d'Errico et al) are getting the relationship right between ochre use and beads. We very much doubt initial usage of was 'utilitarian' and subsequently became symbolic. Take a look at our thread on the paper on ochre as a ritual tradition here
https://c.im/@RadicalAnthro/109540854804414843

For us: the first art was body art, and the first body art was

https://www.sciencedirect.com/science/article/pii/S0047248423001173

itnewsbot, to AdobePhotoshop

Thermochromic Treatment Keeps Solderless Breadboards Smokeless - There’s a point in a component’s thermal regime that’s between normal operation an... - https://hackaday.com/2023/07/08/thermochromic-treatment-keeps-solderless-breadboards-smokeless/

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