What is one way that historians can establish the authenticity of a primary source?

Is comparing the other establish ed sources from the time.You should definitely not believe those who found it since many such occasions proved to be fraudalent throughout history since people claimed to have found dinosaurs fossils and what not but actually lied.Also, you shouldn't rely o. on personal blogs.Endless chemical test can ruin the thing that's in question. or they might not even be that. helpful.