Copyright Infringement, Misattribution and Forgery

Part of Fondation Constant's mission is to protect the legacy of Constant Nieuwenhuys. The foundation is usually informed when works on the market are thought to be a copy, false or misattributed to Constant. Each situation has different implications.

First situation: Infringement on copyrights - an existing work of art is copied by someone, who, without prior permission of the copyright holder/Pictoright, reproduces the work and/or makes the work available to the public-with the artist’s name or his own name. This is considered a breach of or infringement on copyright and will therefore be handled by the organisation that handles the artist’s Intellectual Property rights.

Second situation: Misattribution - a work is mistakenly attributed to the artist. Even though there might not have been the intention to deceive, these works must be unveiled to avoid the illusion for owners or potential buyers that the work represents a certain value as if it were an authentic work from the artist.

Third situation: Forgery - a work of art is created with a deliberate intent to deceive. These works are usually presented falsely as a product of another time and/or artist. This could concern copies of existing works of the artist (falsification) or newly created works in the style of the artist as a consequence of which the work can be misattributed to the artist. Both situations are considered a forgery and a criminal act and will therefore be handled by the justice department and Pictoright.

The negative effects of these dealings have an impact both on individuals involved, the value of the works of the artist, and on the art market in general. Fondation Constant is supportive in the fight against these activities. We have close ties to both Pictoright, the Dutch Criminal Investigation Department for Art Related Crime and parties such as the Art Loss Register, who are all dedicated to eradicating  criminal activities from the art market.

On this page we will post information on the doubtful art works we encounter and where we have encountered them. To avoid law suits we will refrain from mentioning the specific parties involved.

NB: Fondation Constant does NOT give out certificates of authentication. When a work adheres to our guidelines for authenticity we will add it to out digital catalogue raisonné.

Tips when buying art
- Ask for documentation on the work of art. Original works usually are obtainted through offical channels and come with invoices, catalogue/exhibition listings and are mentioned in art books.
- Ask for a provenance. Original works are usually easily traced back to their source, this list of previous owners is called a provenance. Original works of art come with a provenance.
- Do a background check on the seller. Is the seller a well respected art gallery that is well known for selling the art of this artist?
- Do a google search on the prices. If the selling price seems too good to be true compared to works you find at the well renowned galleries, it probably is. However, above a certain price level most galleries do not make their prices public.
- If a work is sold as assigned to... instead of by... it usually means there is reasonable doubt about the work's origin.
- If buying online, check the Terms and Conditions of the online reseller. They might already indicate that they are not responsible of the authenticity of the works they offer!

These are some rules of thumb that should give you an indication of a works authenticity. If after this checklist, you still are unable to reach a conclusion, you can contact Fondation Constant for an assessment. Go to Assessment, for more information.

Fondation Constant cannot be held responsible and/or liable for any damages, costs, expenses, loss or grievances incurred by publication or the use of the content published with regard to "Copyright Infringement, Misattribution and Forgery" on this website.
Fondation Constant will only publish information on such works if, after expert research with regard to the work, the case etc, Fondation Constant is of the opinion that such work is not authorised or authentic. However, these publications are to be considered the opinion of Fondation Constant only. Fondation Constant does not accept any liability for damages, costs, losses etc. arising from such publication.

Fondation Constant is a not for profit organisation and your donations are always welcome and ever necessary: paypal.me/FondationConstantNL

2023 Aquarel, 1997

CID: 7438

Copyright Infringement. A bad copy of the watercolor Femme et enfant from 1997 surfaced on an online auction in the Netherlands. We have no reasons to believe this work was made by Constant (1920-2005). The auctionhouse will be notified.

2023 Oil on linen, 1949, signed and dated top left

CID: 7430

Forgery. We have no reasons to believe this work was made by Constant (1920-2005). The work was offered Marktplaats in the Netherlands. We have no idea of the whereabouts of the work.

2005 Watercolor, no year, signed bottom right

CID: 7429

Forgery. We have no reasons to believe this work was made by Constant (1920-2005). We have no idea of the current whereabouts of this work.

2005 Gouache on paper, 1969, signed and dated bottom right

CID: 7428

Forgery. We have no reasons to believe this work was made by Constant (1920-2005). Surfaced during Constant's life and was explicitly rejected by Constant himself as an authentic work from his hand. We have no idea of the current whereabouts of this work.

2007 Graphic work, no year

CID: 7427

Infringement on copyrights. The work was offered by a renowned auction house in Amsterdam. After it was established that the graphic itself may be an original but that the coloring was in fact not done by Constant the auction house took the work back and redeemed the buyer.

2008 Oil paint on paper, no year legible, signed bottom middle left

CID: 7426

Forgery. We have no reasons to believe this work was made by Constant (1920-2005). Was send to us for authentication by a private collector through a renowned Dutch auctionhouse. Our opninion was communicated to the collector. We have no idea of the current whereabouts of this work.

2008 Paint on paper, 1950, signed and dated '50 bottom right

CID: 7425

Forgery. We have no reasons to believe this work was made by Constant (1920-2005). Was send to us for authentication by a private collector through a renowned Dutch auctionhouse. Our opninion was communicated to the collector. We have no idea of the current whereabouts of this work.

2008 Watercolor on paper, 1987, signed and dated bottom left

CID: 7424

Infringement on copyrights. We have no reasons to believe this work was made by Constant (1920-2005). Was send to us for authentication by a renowned Dutch auctionhouse. The collector was informed of our opninion but offered the work on Marktplaats a year later anyway. We have no idea of the current whereabouts of this work.

2008 Watercolor on paper, no year

CID: 7423

Forgery. We have no reasons to believe this work was made by Constant (1920-2005). The work is a copy of Constant's Junkies, 1987. The work was published in the catalogue of a renowned auction house in Amsterdam, offered for auction by an art dealer from Eindhoven, Netherlands. After authentication it was withdrawn from the auction. We are uncertain whether the work is still on the market.

2009 Gouache on paper, 1969, signed and titled on the back

CID: 7422

Forgery. We have no reasons to believe this work was made by Constant (1920-2005). We have no idea of the current whereabouts of this work.