I don't agree with all of these, but those to which I curl a lip might just be the ones to help another author. I do think #3 is the most sound of advice. And as for dialogue, of course modern expressions will jar and detract.
But the trick is not to make your character use an oath, or pithy linguistic twist, of the time period. The feat is to give your character a characteristic expression or two, which is for that character alone. And not to repeat it too often. For instance, 'Zounds (God's wounds) can fit in many a century. But "'Zounds wrapped in a bandage" makes an expression for that character alone.
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By Maryann Yin
At the 2012 Brooklyn Book Festival, The Last Nude author Ellis Avery,Conquistadora author Esmeralda Santiago and Cervantes Street author Jaime Manrique all joined a panel about writing historical fiction.
Throughout their talk, they shared these five handy tips for writers thinking about the genre.
1. Assemble a collection of art books from the period you are researching. Cut them up and interact with them to get ideas and draw feelings. This will help especially with character development.