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But for storage more than a couple of weeks you should freeze butter.
Butter freezes very well make sure to package in a freezer bag or container.
Sunlight can cause chemical reactions with the soft drink contents.
There are no legislated expiration dates for flour in fact dry goods like flour, sugar and even pasta rarely have more than an encoded date.
In the case of most flours there is nothing to spoil so it does not "expire".
When stored at 40 degrees Fahrenheit and not left out of the refrigerator for extended time periods, milk should last approximately 5-7 days past the "sell by" date." Technically, no. If you stockpile soda, then rotate your stock yearly given the documented shelf life is about 1 year properly stored.
There is not much to go "bad" with ingredients like water, sugar and caramel coloring. The product is unlikely to become harmful past a year but flavor may begin to degrade.