Florida you-tube channel steals my unregistered trademark

Andrew is correct in that having the trademark registered is the best way to get an injunction. You might have common law trademark rights in...

The answer here will depend on multiple factors especially around the food coloring so I would talk to an attorney at least for the free initial...

The research exemption from patent law?

You need to talk to a patent lawyer. There are actually two research exemptions in the US. The first is a common law exemption which you mention...