How can you tell if an Antoine Blanchard painting is an original?

To determine if an Antoine Blanchard painting is an original, examine the signature for authenticity, as his works are typically signed. Additionally, check for provenance documentation, including previous ownership records and certificates of authenticity. The quality of the materials used, such as canvas and paint, can also provide clues, as Blanchard used specific techniques and materials characteristic of his style. Consulting with an art expert or appraiser familiar with his work can further confirm its authenticity.