An idea came to mind — the coronavirus antigen detection mask. The color of the mask is white when not in use. After wearing it, it turns blue if it is negative, and it turns red if it is positive. I’m not a professional, don’t know if it’s theoretic…

Article URL: https://cloud.google.com/blog/products/identity-security/automate-public-certificate-lifecycle-management-via–acme-client-api
Comments URL: https://news.ycombinator.com/item?id=30997735
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