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Making Infrared Cooling Paint From Grocery Store Items (w/Novel CaCO₃ Microsphere Synthesis)

NightHawkInLight · 1.3M views · 2023-07-01 · 40:14

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Overview

NightHawkInLight shows how to make radiative sky cooling paint from grocery and hardware store materials, including a novel calcium carbonate microsphere synthesis. The paint can cool a surface below ambient air temperature in direct sunlight without electricity.

On Hacker News

It comes up whenever radiative cooling coatings are in the news, as a hands-on DIY guide that shows the approach working with household materials.

Recommended by 5 HN people across 4 months · HN mentions 2023–2026

Topics

ChemistryHome, DIY & practical skillsMaterials science
Search by tags
passive coolingdiy chemistrycalcium carbonatesky coolingcoatings

What people said

mkeedlinger · 2023-07 · Strong recommendation

Here is a frankly incredible video of how you could make such a paint if you were so inclined. I don't think it's very practical, but the video is very interesting anyways [VIDEO]

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Tade0 · 2026-06 · Recommendation

There's an interesting guide on how to make radiative cooling paint from common ingredients complete with an explanation why it works: [VIDEO] The catch is that such paint is not particularly robust, much less weatherproof. Beats yogurt I guess, which tends to smell as it turns in sunlight. I have roof windows and was wondering how much I could gain from panels painted like that, but most likely as much as I would using the next best thing - a window sunshade, which I'm using already.

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energ8 · 2025-06 · Recommendation

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] , [VIDEO] and Tech Ingredients [LINK] [LINK]

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Sources

Video by NightHawkInLight, played through YouTube.

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