A later full analytical report (for which we can prepare an offer once we have done the preliminary study) will feature a comprehensive critical comparison of the material evidence and analytical results from your painting with van Gogh's known working practices. It will conclude if they match or if they differ, allowing the reader to form his own informed opinion on the painting. Van Gogh's materials and techniiques have been widely researched which means that there is a substantial corpus of reference data to compare your painting with. A meaningful comparison and reliable conclusions should therefore be possible.
According to the practices of the art market, the last word on the authenticity of the painting rests with a group of specialised art historians. This group would typically consist of the authors of the works cataloge, heirs or famiily members of the painter if available, and eminent art historian specialists. For van Gogh these would be mainly in the Netherlands. Once we have a favourable full analytical report we can help you to make the necessary contacts.
We have been interviewed on many occasions in the past and will be very happy to explain our work to journalists or any other interested party.
I hope this answers your questions. Please do not hesitaate to ask if you require any further information.