Tech Ingredients shows how to make a homemade radiative cooling paint, with a custom liquid panel that cools below ambient temperature outdoors. The video covers the materials and how to apply the paint.
Why Hacker News points people here: HN points to it as an impressive, hands-on DIY demonstration of passive radiative cooling that works in practice.
“Great video about making home-made high reflectivity paint”HN comment, 2023
“There's definitely something here, hopefully someone sells it pre-made, I'd love to try some.”
Shows how to make infrared cooling paint at home
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Two YouTube researchers[0][1] (they make science content that is very much not in the traditional form of YouTube) have been working on Infrared Cooling Paint for almost a year now and have been detailing how individuals can make it at home (although a fairly involved/lengthy process today.) There's definitely something here, hopefully someone sells it pre-made, I'd love to try some. [0] link [1] this video
RecommendsbertilMay 2023
“Their latest video is on passive cooling and very impressive.”
Impressive build video on passive cooling
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Technology Connection is a fantastic YouTube channel that shows how to build all sorts of useful things. Their latest video is on passive cooling and very impressive. this video Warning: the “senior-engineer; knows how to make stuff” energy from that channel is off the charts. Enough to warn people on HN.
RecommendsAzrael3000Jul 2023
“Yes, it is better than regular white paint”
Answers whether cooling paint beats regular white paint
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You can check out Tech Ingredients video [0] on the same topic, which will give an answer to your question. It is: Yes, it is better than regular white paint [0] this video
Recommendsscotty79Nov 2023
“Great video about making home-made high reflectivity paint”
Home-made high reflectivity paint that stays cooler than ambient air
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Great video about making home-made high reflectivity paint: this video Aluminium plate painted with this paint is cooler when exposed to the sun not only than unpainted plate but also ambient air which feels really magical for me.
RecommendsslimsagMar 2024
“they've been working on making paint using this technology with an at-home DIY process”
DIY radiative cooling paint experiments
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You might like NightHawkInLight's videos on the topic[0] and Tech Ingredients[1] - they've been working on making paint using this technology with an at-home DIY process and experimenting with it. [0] link [1] this video
Recommends20after4Mar 2024
“the YouTube channel "Tech Ingredients" do some cool things with radiant cooling”
Cool radiant cooling projects
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Sort of related: the YouTube channel "Tech Ingredients" do some cool things with radiant cooling: this video
Cites itenerg8Jun 2025
“there are a couple good videos about it from NightHawkInLight”
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It's a thing in from thousands of years ago link and today link for PDRC there are a couple good videos about it from NightHawkInLight link , link and Tech Ingredients linkthis video
Cites itLlamamoeOct 2025
Radiative cooling paint reflecting nearly all light
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Are you perhaps thinking of radiative cooling, e.g. paint that reflects close to 100% of all light, excluding the spectrum at which room-temperature objects radiate heat, resulting in a net cooling effect? E.g. [Revolutionary Paint: How to Make Surfaces Stay Cool in the Sun]( this video )
Cites itjcimsDec 2025
“Tech Ingredients did one or two vids as well”
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DIY radiative cooling paint from YouTuber NightHawkInLight - link It has pretty impressive performance. Tech Ingredients did one or two vids as well - this video Was thinking of whipping up a batch for my rv.
Cites itnetsharcJun 2026
“This science-lecturer-esque guy is using Barium Sulfate”
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Using CaCO3 which is calcium carbonate, like the article. This science-lecturer-esque guy is using Barium Sulfate: this video
