Researching the ageing of metal

Through a concentrated period of research I have found multiple methods I could use to age the tin can I am going to use within my film. The first website I came across was an article talking about the various ways metal does age naturally and concludes with the method of putting your desired piece of metal in a fire and extracting a aged looking prop. The second method I looked into included using a substance called 'Plum Brown'. The forum thread I read detailed the substance and pointed out the expense of it. However as the source of the information is not particularly reliable due to mistakes correct by other members of the forum I feel that this method is not to be trusted. However it does mention the use of sandpaper which disrupts the surface of the can possibly leaving an orange residue. The last method I researched was a collection of Pinterest posts on a board titled 'Rusting and Tarnishing'. It detailed various ways to effect metal listing only cheap materials needed such as paint. Below is a series of screenshots of the websites I visited and a conclusion to which method I will be using.

To conclude I feel that the burning method will work the best as it requires the least amount of resources and gives a very effective look. However it will require me to empty the contents and use some specific camera techniques to create the illusion of the protagonist eating from the can, which would mean the insides would be full.