[D] Cold emailing a researcher for collaboration, should I be cautious ?

I'm a master's student, and for a few weeks now I've been working on a project which is strongly related to the work done by researcher A in a recent paper. The project is going well, and I think it could make a great publication, unfortunately I don't know anyone who works on this topic, and some guidance would be useful to defend the project properly. To be clear, the project is already well advanced, it's not just an idea. …

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