hi guys! first post, if it's in the wrong forum my apologies.
i am working on creating a product and have been scouring the net and haven't had any luck finding an answer. i am looking for a cheap chemical in either powder or liquid form that can be sealed in a plastic, and when punctured, react with the environment (assuming oxygen or carbon dioxide) to change color.
the ultimate plan is to microencapsulate the substance and apply it to the outside of plastic. when the encapsulated substance is broken it is exposed to the environment and changes color. with it being microencapsulated, we also have the option of having two chemicals react with each other...my original thought is that it would be more economical to have the environment being the reacting agent (over packing in two substances).
thanks in advance!