RIP Mr Heat Gun. You will be dearly missed.

Sent this video to my inorganic chemistry professor. I bet he'd appreciate this.

Awesome channel! Great to see you back Doug. Really looking forward to more uploads. 👍

Thank you for your work and videos!

Great Video. Keep it up Doug! Always love watching them :)

Awesome lab and demo - you’re an excellent video teacher!

love your work

Oh my god I'm so glad you're back! Did I say that already? I did. I'll say it again though. I'm so glad you're back! I like the factoid about the engineering application. As soon as you said that the thermochromic transition was around 50C I started thinking of ways of using it. I was thinking of a small ampule/glass bead that could be placed in the needed environment as a visual indicator, maybe a multiple compartment ampule thingy with other such compounds depending on the application. I'm sure there are other technologies now that do the job better, and without a cocktail from an EPA inspector's nightmare, but still, pretty cool.

I have done this reaction with mercury chloride and silver nitrate and it did work fine, but there is for sure some silver iodide in it, which causes it to darken after a while in the sun. It's quite fun to make it even though it's extremely toxic.

Thats some very nice inorganic chemistry! The thermochromism of zinc oxide is so often demonstrated but is boring compared to the silver tetraiodomercurate. Speaking about tetraiodomercurates: Neßlers reagent and testing for ammonium-ions would also be a very cool subject for a video.

Doug is back!

at 1:50: in the upper equation (formation of mercury(II)-nitrate) there must be two mol of water on the right side, not only one.

I've been watching your content for several years, don't know why I hadn't subscribed before

Press F to pay respects for Doug's heat gun

I miss the intro. It was probably the best out of every chemistry channel I have ever seen on KZfaq

This man is a wizard

Your forgot to link your Patreon. I found it on another video. It might be a good idea to add it to your channel about/links/description, too.

Thanks for the video was interesting

Great vid and cool chemical!! Kudos. Ps can you do a vid about the chemistry of fire ash? Maybe compare the ash of a few different tree species, make soap with it, or grow some Koh crystals from purified ash soln? Fire and wood ashes are actually pretty interesting: lots of people wonder about it, few know anything.

Mercuric iodide is also thermochromic, you should have made that too whilst you were at it

You should make a video on solvents that you may see in synthesis and their nicknames like methanol is MeOH

Your equation is balanced wrong for mercury. You forgot 2 in front of the water

such a good video! i'm interested if it could be used to make self developing holograms, but i don't want to deal with the disposal... are there less toxic alternatives that are feasible to synthesise at home?

You should check out Big Clives video, just because he has a really cool video with Nail Varnish. I'm sure you've already seen it. But it's a very similar effect, shifting from orange to a bright yellow. It's pretty cool seeing these Thermochromic materials in action! ̶T̶h̶i̶s̶ ̶i̶s̶ ̶t̶h̶e̶ ̶s̶a̶m̶e̶ ̶m̶a̶t̶e̶r̶i̶a̶l̶ ̶w̶e̶ ̶s̶a̶v̶e̶ ̶B̶i̶g̶ ̶C̶l̶i̶v̶e̶ ̶u̶s̶e̶ ̶i̶n̶ ̶o̶n̶e̶ ̶o̶f̶ ̶h̶i̶s̶ ̶m̶o̶s̶t̶ ̶r̶e̶c̶e̶n̶t̶ ̶v̶i̶d̶e̶o̶s̶!̶ ̶ ̶Y̶o̶u̶ ̶s̶h̶o̶u̶l̶d̶ ̶c̶o̶n̶t̶a̶c̶t̶ ̶h̶i̶m̶,̶ ̶h̶e̶ ̶m̶i̶g̶h̶t̶ ̶m̶a̶k̶e̶ ̶a̶ ̶n̶o̶t̶e̶ ̶o̶n̶ ̶t̶h̶e̶r̶e̶.̶ ̶ ̶I̶t̶'̶s̶ ̶t̶h̶e̶ ̶o̶n̶e̶ ̶w̶i̶t̶h̶ ̶t̶h̶e̶ ̶n̶a̶i̶l̶ ̶p̶o̶l̶i̶s̶h̶,̶ ̶s̶h̶o̶w̶i̶n̶g̶ ̶s̶o̶m̶e̶ ̶o̶f̶ ̶i̶t̶s̶ ̶u̶s̶e̶s̶,̶ ̶b̶u̶t̶ ̶i̶t̶'̶s̶ ̶t̶h̶e̶ ̶e̶x̶a̶c̶t̶ ̶s̶a̶m̶e̶ ̶e̶f̶f̶e̶c̶t̶.̶ ̶ ̶B̶r̶i̶g̶h̶t̶ ̶Y̶e̶l̶l̶o̶w̶,̶ ̶D̶a̶r̶k̶ ̶o̶r̶a̶n̶g̶e̶ ̶a̶n̶d̶ ̶a̶l̶l̶.̶ ̶ ̶V̶e̶r̶y̶ ̶c̶o̶o̶l̶ ̶t̶o̶ ̶s̶e̶e̶ ̶t̶h̶e̶ ̶c̶h̶e̶m̶i̶s̶t̶r̶y̶ ̶b̶e̶h̶i̶n̶d̶ ̶i̶t̶!̶ EDIT: I was wrong and changed the information! Big Clives nail varnish goes from orange to yellow! I wonder what THAT one is. kzfaq.info/get/bejne/iJpzZq-ZnJfddoU.htmlm25s

Are the copper and silver compounds the only ones that show the effect? Very interesting stuff

That’s exactly what I do to dry my powders and works well

Nicely done, sir. I didn't know about this compound until I saw this video, so thanks for producing it. (Sorry about your heat gun.) BTW, Doug, here's a student lab instruction for making copper (I) tetraiodomercurate, which is also thermochromic -- and, like the silver salt, also changes its electrical conductivity with temperature. (The high temperature form is more conductive than the low temperature form.) The instructions also explain that the change in color is due to a phase change from one crystal structure to another. people.umass.edu/~mjknapp/Chem242/2004%20Experiments/CuHg2I4Lab.pdf

Sweet!!!

Hey Doug, you forgot the patreon link.

The way you make your capital 'H's blows my mind...

It looks like turmeric when it's cold.

Wouldn't it be better if you poured the KI solution into the beaker with the metal salts? That way you'd have one less beaker to decontaminate (cleaning glassware that's been in contact with mercury is a pain in the ass) and pretty much all the mercury would be in the precipitate.

Nice! and HgJ2 changes from red to yellow at 126degC you could try this one out too

So is bismuth oxide a thernochromatic compound? As it cools it determines the color of the metal, which gives bismuth crystals that wide array of color. Unless I am not understanding the bismuth oxide formation.. Regardless great video my dude÷

What if we want it change at 30 or 40 c Is that possible? And what if we want to do another color ? Thanks for the video ♥️

Please do a CH3MgBr synthesis

Where are you Doug? If you need help editing or whatnot, I'm happy to give it a go. Free of charge. I just want some videos man. You used to be compared with nilered. You got potential.

Cool AF! I had hot wheels that did this!

Hey Doug I am Hardik are there several other compounds that show the same property ?? And is this effect occurring because of jumping of electrons in an exited state from ground state when you apply heat to it ??

Zinc oxide goes from white to yellow when it is heated.

Any less toxic thermlchroma substances out there?

Oh my solvated mercury salts... I hope you like cilantro.

ＴＨＥＲＭＯＣＯＭＵＮＩＳＭ

Nice video but you should not use latex gloves with mercury salts because it can permeate very easily, nitrile gloves have better barrier performance (but not absolute, double gloves are recommended)

Am I the only chemistry illiterate person here? I want to know more, but it seems that I may need to get more than a few textbooks. Does anybody have a good resource to get started or a fav book that explains fairly basic concepts to a novice? Thanks if you answer.

Is there a non mercury analogue of this?

why would nitric acid even form? It's a strong acid, so NO3- is more stable on its own

Then shouldn't the formula be (2agno3 + hg(no3)2) + 4ki? I know it's irrelevant to everything, however if the silver and mercury salts must be mixed first wouldn't the formula show that? lol I'm a noob to chemistry, so don't tear me apart!

why make this?

I subscribe but I clicked for the title.

Very interesting. Thank you for not being a giant wuss with the metals and showing actual cool experiments we might have seen in class before everything became watered-down and lame. Safety is great, sure, but today we have a generation of chemists who are so out of touch with the reality of what they are handling that you end up with things like that Periodic Table of Videos rubidium farce. No one does the old timey stuff anymore. Thank you. 😀

I'm from Iraq you are amazing but you speaking a fast 😅

No square brackets around the complex ion? I am disappointed... jk

Wonderful Video but i found organic chemistry ist much better.

Sounds like you need to slow down. Good video.

Not a very practical property given the high toxicity of the ingredients.

Second!

Hi

Sweet!