u/tango_delta_nominal

I work at a place that has an indoor 10ft x 10ft sand box filled with (washed) fine play sand. It's about 1 ft deep. We would like to colour the sand to a light gray colour (a bit like cement gray). Is there a non-toxic paint/dye you recommend we use for such a large quantity of sand? Everything we find online are small quantities for arts & craft projects.

I'm having a hard time finding gray-coloured washed fine sand (we're in Eastern Canada), so the next best option would be to paint/dye the sand we already have.

Hi! My cubesat student design team is considering incorporating a small, 2W resistive flexible heater in our design. The input voltage will be around 8-8.4V. We're open to using more expensive space-grade ones if we absolutely have to, but we're happy to try cheaper alternatives at first.

Are there suppliers you would recommend we look into? We saw that Omega and Minco sell high-quality & expensive ones, while JLCPCB manufactures custom polyimide resistive heaters for cheap, although those ones do not come with an outgassing certificate. We do have access to a TVAC chamber to test/certify hobby-grade COTS heaters. Thanks!