Thanks. The purple vapour is visible evaporation. Other solids evaporate, such as ice in a freezer and camphor and menthol at room temperature. I hope you have made a note of this.

And there was I, thinking you sat down and watched these videos with pen in hand eager for all the information

if you go to 13 seconds in the video, there is a QR code to a supplier. I hope that helps

It works better with bottle top crucible. See Cleapss website. Do a comparison of methods if you want.

It is all about energy. I think chemists are rather scared of the topic. We invent octet rules to explain and ditch it. We are awe of physics teaching.

With the correct equipment on silica, you get this for Parker and Octopus Fountain Pen Ink. But inflation means schools are increasingly unable to afford this equipment. The effect is stunning using the solvent mixture butan-1-ol/ethanol/water in the ratio of 3:1:1 and a drop of conc ammonia.

www.youtube.com/watch?v=bj1B... This is copper wire into 0.06 AgNO3 on a plastic surface under a USB microscope. Mobuke phone are good now. ooops!

See www.youtube.com/watch?v=p_MU... to see how to make NO gas in a syringe.