Netherlands Institute for Conservation, Art and Science

NICAS Colloquium

07Dec2017 12:00 - 13:00


The next edition of the NICAS Colloquium takes place on Thursday, 7 December 2017, from 12:00 to 13:00 in conference room B of the Atelier Building (Hobbemastraat 22, Amsterdam).


The chair of this colloquium will be Matt Tyler (Rijksmuseum/The National Gallery), PhD candidate doing research on smalt.


The following presentations are scheduled for this edition of the NICAS Colloquium:

Bas van Velzen

Rags in papermaking

Rags were once the base material for papermaking and remained so for centuries. Although this primary source of fibres was collected by men and women of low social status, rags were sorted with great skill and a refined sense of their many qualities. But modern man has little knowledge of this profession. This talk offers a look into historical rag classifications and the men and women that collected them. We must surely begin at the source in order to better understand paper: what are rags and what are their qualities? How does the papermaker transfer those qualities into a specific paper?

Bas van Velzen was trained as a paper conservator between 1980 and 1984 and worked in private practice before becoming a lecturer in paper conservation at the University of Amsterdam.


Inez van der Werf

Felt-tip pens and markers: pigments, dyes and binders

Felt-tip pens are used in modern drawings and architectural sketches, while marker pen inks can be frequently found in graffiti. Chemical analysis of these inks is important for the development and application of cleaning methods and to guarantee appropriate conservation conditions. The inks were analysed with a multi-technique approach involving various chromatography and spectroscopy techniques. The marker pen inks revealed to be based on a wide range of binders comprising alkyd and styrene-acrylic polymers in combination with phthalocyanine, dioxazine and azo pigments. In the felt-tip pen inks styrene-acrylic resins and natural gums were mainly found as well as complex mixtures of synthetic dyes. Preliminary data on fading were also obtained.

Inez van der Werf is researcher in Analytical Chemistry at the University of Bari (Italy). She has also a background in restoration of paintings (Istituto Centrale di Restauro, Rome).

NICAS Colloquium

More information about the NICAS Colloquium can be found here.



Thursday, 7 December 2017


12:00 – 13:00 hrs


Conference Room B, Atelier Building
Hobbemastraat 22, Amsterdam

Published by  NICAS