Even more to see here (now)


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Quote: Afterglow colors store incident light in the form of excitation energy (phosphorescence). Afterglow colors contain toxic heavy metal salts and are only suitable under special precautions (strong binder) for everyday use. They are based on the Luminova pigments.
 
Quote: Afterglow colors store incident light in the form of excitation energy (phosphorescence). Afterglow colors contain toxic heavy metal salts and are only suitable under special precautions (strong binder) for everyday use. They are based on the Luminova pigments.

Note that is only one brand of one kind of phosphorescent material - they are not all like that (most are not as efficient as that stuff though).

So, I wonder what they're using to do stuff like these:
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https://www.amazon.com/Alan-Stone-Decorative-Aquarium-Backyard/dp/B072KP75GS
 
This UK-based company seems to be making solvent-free, non-toxic luminous paint:

https://glowtec.co.uk/starglow-paint/

They have a chart showing which colours glow for longer lengths of time:

glowpaint-comparisons.jpg
 
Clearly a gigantic hardware store chain needs to protect their shovels and glow in the dark exit signs from being viewed by... Europe?
Europe has a lot of privacy protection laws in place now that do require overhead to maintain. It is far cheaper and easier to just deny access than to comply, considering they do not do any European business at all.
 
Europe has a lot of privacy protection laws in place now that do require overhead to maintain. It is far cheaper and easier to just deny access than to comply, considering they do not do any European business at all.

There is something wrong about that though. That a company should have to completely shut out entire regions of the globe/internet for fear of being sued for privacy laws put in place in countries where it doesn't even do business. Kind of like China's Great Firewall only backward and a bit sideways - same effect though of people effectively being blocked from sites by actions of their own governments. Of course there is the counter argument that these laws are to protect the privacy of the citizenry from the evil or at least careless snooping corporations - which is also somewhat valid... Gets pretty tangled.

Regardless, the Home Depot is just a gigantic US hardware store chain. Plywood, nails, exit signs, plumbing parts and real cool power tools that none of you Europeans get to see. Oh, and plastic Orange buckets that are great to blow up fireworks in because they glow like lamps and ... We're just going to keep those all to ourselves here in 'murica.

Crude likely not work appropriate, but made me think of this Denis Leary bit... Warning: crude language.
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[URL]https://www.youtube.com/watch?v=UrgpZ0fUixs[/URL]
(to keep it from possibly being auto launched on anyone)
 
In general, the following 3 variants exist. At least that's how the chemical industry in Germany thinks about it. (chemie.de\ wiki)
Here is the full quote:

A luminescent color refers to a colorant that emits more visible light than is incident from the outside, that is, more than would be possible by directional or diffuse reflection.

The energy required for this can be provided on the basis of various physical principles:

-Daytime light color turns invisible UV light into visible or blue light in reder

-Afterglow color stores energy that has been absorbed by the lighting and releases it with a time delay

-Radioactive luminous color, in which the energy comes directly or indirectly from the radioactive decay of a substance


luorescent inks

Fluorescent fluorescent daylight (neon colors) convert the blue and near-UV of daylight into light of longer wavelengths (typically blue-green, yellow, and red). Yellow and red are perceived much brighter by the eye with the same light intensity (V-lambda curve of the sense of sight). As a result, a significant increase in contrast is achieved, in particular in cloudy weather and at twilight (higher proportion of blue in daylight) (eg warning surfaces on rescue rescue vehicles).
phosphorescent

Afterglow colors

Afterglow colors (but not: "noctilucent colors") store incident light in the form of excitation energy (phosphorescence). Afterglow colors contain toxic heavy metal salts and are only suitable under special precautions (strong binder) for everyday use. They are based on the Luminova pigments.

Radioactive light colors


A radioactive luminescent color always consists of a radioactive substance, formerly mostly radium salt, today either tritium gas or promethium salt, and a fluorescent substance, such as zinc sulfide. The radioactive radiation stimulates the fluorescent substance (luminescence).

The fluorescent substances or other additional substances used are often capable of phosphorescence. Therefore, apart from permanent lights, after exposure to light a strong afterglow, which decreases within seconds, can be observed.
 
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I think as (hopefully) most Countrys are go away from theyre Nuklear Energy to Wind and Solar Energie, whe shouldnd use Radioaktive Color for our Pyra just because its glow in the Dark..

Whe have some Pretty Cool RGB LED Lights on the Pyra, and the only purpose i would see for a glow in the dark collor would be that you can find your Pyra faster in the Night..
But i dotnt need to find my Pyra in the Darknes as i know exactly where it should be:
- In my Pocket
- In my Hands
- On my Desk to form a Work PC or just to recharge..
 
Glow in the Dark Matterial is a Powder for plastics. You use the poweder with the Raw matterial,color and stirring. But it is Very Toxic and Very expensive to buy . I have done this job in the past and i stoped it after the first production . It is really Dangerous to work with that powder. I am not really sure if it can work with PolyCarbonate, Last time i used it on LLPDE .Anyways Since it is very toxic to work with that powder you have to get an injection machine in a special place for the powder not to go anyware else, You need to have special mask and a guy (me) who will do the job in a close wall with ventilation. Well afortunatly i dont have prepare something like that yet.If there is a need and the job is big i can invest creating it, but this convertation is for knowledge only at the momment :) .
 
@azouls
Thanks for explaining the "cost". It's important that you know about it to make a good decision. The more knowledge you accumulate about all sorts of stuff the better! I personally wouldn't support a glowing Pyra due to my concern of the extra unnecessary environmental and health impact. A handheld device is also something you are going to hold in your hand a lot and I wouldn't want to give it to a kid even if its "not risky". I’ve seen all sorts of crazy allergic reaction because of chemicals in safe products.

I'd really really love to have a transparent Pyra. That would make me incredibly happy : )

I hope ED will sell some in his shop. I think I remember the previous case company made some bad quality ones. Of course I hope to get my hands on a good quality clear case but under two conditions I would buy bad quality clear cases. 1# bad quality transparent cases are the only transparent case available. 2# good quality cases will be available BUT separate bad quality cases in form of a donation bundle will be sold to collect donation for the Pyra project.
 
They don't use toxic Zinc-Sulfide in their products. They use the non-toxic Strontium-Aluminate.

https://glowtec.co.uk/faqs/

Check the FAQ section, particularly these 2 questions:

"Are your products really as safe as you claim?"
Yes of course. Remember, this is next-generation, all-new technology, it is not the radioactive stuff used on watches decades ago or the old-fashioned Zinc-Sulfide stuff that only glows for a few minutes. This is Strontium-Aluminate based technology which is not only completely safe, it can last 10 times longer and glow 10 times brighter.

"What is Strontium-Aluminate?"
There are two types of Glow-in-the-Dark (GITD) technology in use today, one is Zinc Sulfide and the other newer form is Strontium Aluminate with Europium as an activator. This powder (or crystal) is a non-radioactive phosphorescent pigment produced from rare-earth elements and provides an extreme long-lived afterglow. This afterglow last about 10 times longer than conventional (Zinc Sulfide) pigments and is about 10 times brighter.

In any case, I am not making a request here, simply exploring possibilities and sharing what I found. An idea for me to try out is to buy a clear case and coat it with this afterglow paint on the inside.
 
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... It is really Dangerous to work with that powder ...

yuck, i wouldn't touch it too, please stay safe. :eek:
asked the other way round, are there any kind of 'organic'/special untoxic/'natural'/whatever plastics on the market?
material that is less of a burden to the environment when disposed and safe when creating/using it and strong/usable the same time?
 
Hardwood and softwoods contain as builders cellulose (cellulose) and lignin. Cellulose is important as a raw material for the production of paper.

For a long time rags and fabric shreds were used as fiber raw materials. Only since the mid-19th century, the paper is made of wood.

In 1859, a process for "increasing the strength of parchment paper" was patented in England. It was the impetus for the significant development of modified natural materials based on cellulose.

As the oldest malleable plastic, which gained economic importance, cellulose nitrate was developed in England. It became world famous under the name Celluloid.

The slight flammability and consequent fire hazard motivated many researchers to develop other processes for the production of cellulose plastics.

Already in 1865 succeeded in the production of cellulose acetate (CA) from cellulose and acetic acid. In 1919, the production of molded parts from CA injection molding compounds was patented.

Cellulose acetate has the following properties, among others:

high strength and impact resistance
high surface gloss, good grip
insensitive to scratches because of the high surface elasticity
no stress cracking
high light transmission

In the 1930s, cellulose mixed esters were developed in Germany and America, which in addition to acetic acid also contained butyric acid. The new plastic cellulose acetobutyrate (CAB) was launched in 1946 for injection molding.

Compared to CA, CAB has:

a higher strength, hardness and toughness
a better surface gloss
a clearer transparency
a higher UV resistance

Despite the rapid development of plastics technology, there is still no transparent material that would be better suited for tool handles than CAB.

Eastman Chemical Company of Kingsport, Tennessee is the only manufacturer of CAB in the world.

The required cellulose was originally obtained from cotton. The increasing demand for textiles and cigarette filters led to shortages and price increases. As a source of raw material was therefore changed to softwood.

Today, three new trees are planted for each two felled trees for the production of cellulose plastics.

Source: pb swiss tools
 
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