@lizzard @n_to
How did you made these? 🤩

#cyanotype #blueprint #prussianblue

Used the bright sun for some #cyanotype experiments (aka #blueprint, aka #prussianblue ) with my son.

So much fun!

#PrussianBlue pigment (ferric ferrocyanide) might be a key component in solving this problem. Although Na-ion #batteries made with Prussian Blue cathodes have less energy density than Li-ion batteries, they have exponentially greater #recharge cycle durability, thousands of recharge cycles without degradation, compared with a hundreds for the best Li-ion batteries, cost far less to produce (one-quarter to one-third the cost of Li-ion), are generally safer, and don't rely on rare minerals.

Smart Contact Lenses Tell You Where to Go https://hackaday.com/2023/02/15/smart-contact-lenses-tell-you-where-to-go/ #augmentedreality #VirtualReality #electrochromic #SoftwareHacks #PrussianBlue #contactlens #bioniceye #optics #eyes

Smart Contact Lenses Tell You Where to Go - Augmented Reality (AR) promises to relieve us from from the boredom of mundane rea... - https://hackaday.com/2023/02/15/smart-contact-lenses-tell-you-where-to-go/ #augmentedreality #virtualreality #electrochromic #softwarehacks #prussianblue #contactlens #bioniceye #optics #eyes

Prussian blue was discovered by accident by painter Heinrich Diesbach in Berlin in 1704-5 (which is why it is also known as Berlin blue) while attempting to create a paint with a red hue.

Thanks to @luxescipod for the tip!

#science #sciencefacts #blue #prussianblue #pigment

https://www.chemeurope.com/en/encyclopedia/Prussian_blue.html

"Prussian Blue" (1977), Kazuo Shiraga (Japanese, 1924–2008), ink and watercolor, 27 x 23.8 cm #PrussianBlue #KazuoShiraga

https://www.wikiart.org/en/kazuo-shiraga/prussian-blue

I should tag @fountainpens on this thread about #PrussianBlue ink. If you want to see the original thread on this topic on Fountain Pen Network, you can find it here:

https://www.fountainpennetwork.com/forum/topic/241257-mrs-stewarts-concentrated-liquid-bluing

Also, although it contains a cyanide ion, the cyanide is so tightly bound to the iron that it is completely harmless and is actually used as internal medicine for chelation therapy, to remove harmful heavy metals from the human body.

Finally, #PrussianBlue may be the key to more sustainable future electrochemical rechargeable storage batteries, which although they do not provide quite as high energy density as Li-ion cells, withstand tens of thousands of recharge cycles, instead of hundreds.

An 8 oz bottle will cost you less than $5 and can be found in virtually any grocery store.

There is, however, one caveat. The Sheaffer pen company did some research back in the 1940s (IIRC) and discovered that there is a possibility that #PrussianBlue can corrode gold alloys, which are often used for nibs in expensive #FountainPens. Prussian Blue is ferric ferrocyanide, and presumably the corrosion would be due to ion replacement. Cyanidic compounds are used in gold refining because of this. …

The reason I use cheap #FountainPens, other than that they write just as well as the expensive pens I used to use, is my preferred daily use #ink is Mrs. Stewart's Concentrated Liquid Bluing. Yes, laundry bluing. It's identical in composition to historical formulae for #PrussianBlue ink. Prussian Blue was the first synthetic inorganic pigment, and has the second-smallest particle size after carbon black, so it flows through pens without clogging. It's water-resistant, lightfast, and gorgeous. …

https://www.alternativeprocesses.org/post/notes-on-the-colour-blue
Of interest #cyanotype #prussianblue #postinspirationalantecedent