1. Provenance:
* Documentation: Look for any accompanying documentation like certificates of authenticity, exhibition catalogues, or auction records that can trace the painting's ownership history back to Blanchard.
* Gallery or Auction History: If the painting has been sold through reputable galleries or auction houses, their records can be a valuable source of information.
2. Style and Technique:
* Compare to Known Works: Carefully compare the painting to authenticated works by Blanchard. Look for consistency in style, brushwork, color palette, and subject matter.
* Expert Opinion: Consult with art historians, art appraisers, or experts specializing in 18th-century French painting. They can analyze the painting's technical details, materials, and composition to determine its authenticity.
3. Material Analysis:
* Pigments and Medium: A trained eye or scientific analysis can help identify the specific pigments and mediums used by Blanchard. Any discrepancies might indicate a later forgery.
* Canvas and Support: Examination of the canvas, stretcher bars, and other supporting materials can reveal clues about the painting's age and origin.
* Wood Panel: For older paintings, wood panels can be analyzed for their species, age, and any signs of restoration or tampering.
4. Condition and Restoration:
* Restoration History: A history of documented restoration can help determine if any changes or additions to the painting have been made.
* Condition: Analyze the painting's overall condition, including signs of aging, wear, and tear. A piece that is too pristine might be suspect.
5. Caution and Professional Evaluation:
* Be Wary of Claims: Be cautious of anyone claiming to have an original Blanchard without providing substantial evidence.
* Professional Appraisal: Always seek a professional appraisal by a reputable art expert before purchasing or accepting a work as authentic.
Important Notes:
* Authenticity is Not Guaranteed: Even with thorough examination, there is no guarantee of authenticity. Forgeries can be extremely sophisticated.
* Beware of Scams: Be aware of scams and individuals attempting to sell fake or misrepresented artwork.
* Research and Consult with Experts: Thorough research, expert consultation, and a healthy dose of skepticism are essential when considering any art purchase.
Remember, investing in art is a serious endeavor. Always exercise caution and seek professional guidance to ensure authenticity and avoid disappointment.