Spray to see a laser

Discussion in 'Supporting Physics' started by MaddyT, Feb 26, 2019.

  1. colloidal silica is only about £12 a litre
  2. Use Talcum powder! Results are good plus its cheaper and the lab will smell nice too!
  3. can be slippery though when it settles on the floor.
  4. Is there a Hazcard for Rhodamine? Couldn't find one on CLEAPSS.
    We currently use milk for refraction or fluorescein (for eye model) but the Rhodamine looks lovely.
  5. I have a problem with Rhodamine, got sensitized to it in industry. Brings me out in a rash! Not good as its used in various cleaning products as a colouring!
  6. Where do you buy your colloidal silica? Any particular spec.?
  7. We used to get it somewhere else and it was better but we now get it from Sigma Aldrich Ludox AM 30.

    I use about 20ml in 1.5 litres of water.
  8. Thanks Nick. I'll see if I can get hold of some.