I want single compound/reagent/chemical/paper/dye which gives colored reaction with pure ethanol and it should be non toxic as well. By simply adding/diping it to pure ethanol it should give color change at room temperature.
If you are looking for an edible reagent, I can offer egg whites (albumin) for some consumptions. The egg protein is denatured in the presence of ethanol, and a white precipitate is formed. This method is known as cooking egg without heat but scientifically used for purification of lysozyme and ovalbumin. I think this is the best easy-access and non-toxic reagent for detecting ethanol.