[Obowles]

Hello

I'm new here and needed some expert advice, i need for example, if i had a sealed bottle of liquid and it was clear in colour then when i opened the bottle the liquid would change colour due to oxidation. what chemicals would i need to make this happen??

Please help me

Thanks

Oliver

[Hunter2]

The question is what kind of liquid is in the bottle, a lot of organic compounds have that behavior, like Amines and unsaturated compounds. The oxygen in the air will oxidize it.

[Wastrel]

Most vat dyes would fulfill the brief, for example a solution of leuco-indigo.  It's not going to be spectacularly fast though.

[Tittywahah]

I use a number of chemicals that do this but very slowly.  For example one very common one is Ferric ammonium citrate and Potassium ferricyanide mixed, green to light or deep blue; but how fast do you need it to change.  Ferrous chloride also does this but again very slowly - bright lime green to dark green brown, (days).