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

NightHawkInLight · tutorial · Watch on YouTube

ChemistryHome, DIY & practical skillsMaterials science

What it is

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.

Why Hacker News recommends it

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.

  • 5 people recommended it
  • 4 different months
  • 1 strong recommendations
  • first 2023, last 2026

What HN commenters said

  1. “Here is a frankly incredible video of how you could make such a paint”

    Incredible video on making such paint, impractical but interesting

    mkeedlinger, 2023-07 · Strong recommendation · in “Scientists at Purdue have created a white paint that can cool a building”

  2. “this video is a great guide”

    Guide to making radiative cooling coatings from household materials

    K0balt, 2023-07 · Recommendation · in “To Help Cool a Hot Planet, the Whitest of White Coats”

  3. “you can already get decent results with a material that can be prepared at home”

    Home-made cooling material that works decently

    Tade0, 2023-07 · Recommendation · in “To Help Cool a Hot Planet, the Whitest of White Coats”

  4. “You might like NightHawkInLight's videos on the topic”

    DIY radiative cooling paint experiments

    slimsag, 2024-03 · Recommendation · in “Using a solar oven as a radiant refrigerator at night”

  5. “there are a couple good videos about it from NightHawkInLight”

    One of a couple good videos on passive radiative cooling

    energ8, 2025-06 · Recommendation · in “NASA's Voyager Found a 30k-50k Kelvin "Wall" at the Edge of Solar System”

Excerpts from Hacker News comments, linked to the originals. Summaries and labels were written by a language model from those comments.

Topics: passive cooling, diy chemistry, calcium carbonate, sky cooling, coatings

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