Is sea salt safe for home canning?

Yes, sea salt can be used in place of regular table salt as there is virtually no difference between most products labelled "sea salt" and other table salt. Some more expensive and regional sea salts may have certain extra minerals in them which give them a different color, such as pink, or black. These will also have slightly different flavor contributed by the minerals. But most sea salt is pretty much the same as white table salt. Remember, all salt came from the sea, at some point, whether it is mined from salt deposits underground, or from salt flats left over from a salty lake, or from the shores of a sea.

However, most pickle recipes call for canning or pickling salt rather than regular table salt. Picking salt is made without the use of anti-caking agents or iodine. If you use regular table salt or sea salt, the anti-caking agents may make the brine cloudy, and if the salt is iodized, it may make the brine darker. Non-iodized salts are readily available, and although the brine may be a bit cloudy, the pickles should taste fine.