https://culturehustle.com/collections/black/products/raven-carbon-black-high-grade-professional-acrylic-paint-by-stuart-semple-100ml https://culturehustle.com/c

https://culturehustle.com/collections/black/products/raven-carbon-black-high-grade-professional-acrylic-paint-by-stuart-semple-100ml https://culturehustle.com/collections/black/products/raven-c... It mentions it's fabric-safe, so presumably durable enough for keyboards.