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

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Fondation Constant

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2021 Drawing, no year, signed

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2021 Watercolor, 1995, signed

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2020 Drawing on paper, 1948

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2021 Photo

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2021 Gouache, 1948, signed

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2021 en 2002 drawing, no sign., no yr

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2020 Drawing, signed Constant, no year

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2020 Mixed technique on paper, 1973

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2020 Gouache, 1950

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2020 | 2013 Oil and sand on canvas, no year

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2020 Oil on linen, signed, 1956

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2020 Watercolor, signed, 1997

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Note Constant

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2020 Oil on linen, titled "Kat", signed, 1949

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2020 Oil on linen, Kat, signed, 1949

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2020 Oil on linen, titled "Vogel", signed, 1949

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2020 Tekening, 1945

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2020 Watercolor II, 1997

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2020 Watercolor, 1997

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2016 Oil on canvas, no year

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2018 Mixed technique on canvas, 1978

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2018 Mixed technique on canvas, 1981

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2018 Mixed technique on panel, no date

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2018 Mixed technique on canvas, 1980

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2018 Mixed technique on canvas, 1975

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2018 Mixed technique, no year

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2018 Moeder en kind, 1952

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2018 Washed Ink, signed Constant 1997

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2017 Collage, 1959

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2017 Gouache on paper, year unknown

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2017 Watercolor, no year

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2017 Gouache on paper, 1960

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2017 Lithograph, no yr, signed

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2017 Oil on canvas, 1960

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2016 Oil on canvas, no yr, signed

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2016 Oil on canvas, no yr, signed

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2016 Oil on canvas, no yr, signed

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2016 Oil on canvas, no yr, signed

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2016 Drawing on paper, no year

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2016 Watercolor on paper, no year

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2016 Oil on ..., 1958

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2016 Oil on linnen, 1949

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2016 Watercolor on paper, 1948

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2016 Watercolor and ink on paper, 1952

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2016 Ink on paper, no year I

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2016 Ink on paper, no year II

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2016 Gouache on paper, 1969

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2016 Ink on paper III

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2016 Gouache on paper, 1960

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2016 Gouache on paper| Le vieux clochard, 1994.

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2016 Mixed techniques on paper, 1940

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2016 Gouache on paper, no year

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2016 Watercolor, 1949

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2016 Oil on canvas, no year II

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2016 Collage with watercolor and pencil, 1969

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2015 Drawing with pencil on paper, 1961

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2015 Oil and watercolor on canvas, no year

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2015 Oil on cardboard, 1955

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2015 Oil paint on pressed plate, 1954

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2014 Watercolor on paper, no year

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2014 Watercolor on paper, no year

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2014 Gouache on paper, 1951

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2014 Mixed technique on paper, 1969?

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2013 Oil and pencil on paper, 1948

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2013 Charcoal, ink and gouache on paper, no year

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2013 Watercolor on paper, 1975

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2013 Gouache, no year

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2013 Gouache on paper, no year

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2012 Gouache on paper, 1960

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2012 Construction, no year

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2012 Watercolor on paper, no date

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2012 Watercolor on paper, no date

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2012 Gouache on paper, 1949

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2012 Sketchbook, signed, no year I

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2012 Sketchbook, signed, no year II

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2012 Watercolor on paper, 1975

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2012 Watercolor on paper, 1987

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2012 Oil on canvas, no year

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2012 Oil on canvas, no year

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2011 Watercolor on paper, no year

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2011 Construction with plexiglass, 1956

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2011 Oil on linen, signed

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2011 Oil on canvas, date illegible

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2009 Mixed technique on paper, 1951

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2009 Gouache on paper, 1969

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2008 Watercolor on paper, no year

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2008 Watercolor on paper, 1987

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2008 Paint on paper, 1950

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2008 Oil paint on paper, no year legible

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2007 Graphic work, no year

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2005 Gouache on paper, 1969

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2005 Watercolor, no yr, sign