Traditional extraction methods of paint samples or textile samples for chromatographic analysis are often too aggressive. Often, not only fragile colours (dyestuffs) like carrotenoids (present in for example; annatto seeds and safflower floss) are destroyed during the extraction. Likewise coloured sugars could be lost or even transformed into another new molecule. Preserving these sugars by using a soft extraction technique could be extremely useful as the sugars could provide information about the original botanical or biological source, also provide information about how the dye or pigment was prepared or something about the environment in which the plant or insect/mollusk source existed.
,… Another remarkable component present in some Rubia species and in particular Rubia tinctorum L. (Madder) is lucidin-3-O-primeveroside. This particular component drives off the varied carpet beetle (Anthrenus verbasci L.) called in dutch ‘Museumkever’ because it is considered a pest because it not only scavenges on other dead insects but also hair, feathers, natural fibers and dead skin, it leaves its eggs in tapestries and woolly objects leaving a black corroded areas when it hatches.
The CHARISMA project will organize next year two workshops devoted to natural organic colorants.
Prior to these workshops an expert meeting was organized at the Netherlands Institute for Cultural Heritage (ICN). The expert meeting was dedicated both on dyeing and pigment preparation from natural organic colorants. The main goals of this meeting were; one to serve as a pilot for the workshops to be held next year in Munich and Brussels, two to share knowledge with the European partners working with these subjects and three to create new reference materials, that can be used as study objects.
Primary task of botanical gardens nowadays is not scientific contribution but keeping visitor numbers. The Netherlands has 112 gardens, of those 10 arboretums and 25 independent botanical gardens three zoo-connected botanical gardens and 4 university gardens. A respectable number of gardens for a small country like the Netherlands. ‘A luxury problem if one or two gardens have to close’…
The task innovative methods and instrumentation for laboratory research is concerned also with organic colouring matters in works of art and objects of cultural heritage. These materials often suffer changes in colour or other forms of deterioration over time. One result of this is that our perception of the object itself may be affected; more prosaically, the colouring matters are sometimes hard to identify. Thus a better knowledge of these materials will help to improve our understanding of these art works and also assist considerably in their conservation