All watermark records and documents on heridate.com have been collected from 2009 onwards. To make the paper structures and watermarks visible we worked with transmitted light images. Unfortunally the most of these transmitted light images contain besides watermarks and paper structure information also parts of imprints, drawings, handwritings and labels. For this reason, we used several digital post-processing methods (f.e. the image subtraction method) to make the watermarks visible more clearly.
Afterwards, we put these pictures in gray scale and get them inverted (reversed). This means in detail: the originally lighter (thinner) parts in the paper appear now dark in the pictures. The originally darker (thicker) parts become bright. For a better visibility, we produced digital tracings of the most collected watermarks on heridate. Tracings in general – even if you try to work as exactly as possible – can have some deviations of the real paper watermark. For a detailed watermark analysis, we advice you to check also the paperstructure images besides the watermark tracing. For discovering smallest differences between two watermarks, we advice you to use an imaging software with a multi layer option (f.e. Photoshop).
The base of watermark-based dating is their “family relationship”. This relationship can be: ‘identical’ (completely congruent) or ‘similar’ (almost identical, differing only by some shiftings or damages) or just from the same motive type (also called ‘variants’). If you take over the dating from a dated receipt to an undated object with identical watermarks you can fix the date with a tolerance of +/- 2 to +/- 4 years. Also work and serial correlations can be concluded by findings of identical watermarks.
All information provided on heridate.com reflect the state of research at the time of detection of the watermark. The latest status is announced on each record. Everything on heridate – especially informations about artits, dating and localization – is subject to change due to a recent research project or new publications! All information on heridate.com represent voluntary information! heridate.com assumes no responsibility.
All data presented on heridate.com are protected by the unlimited copyright of the respective authors and creators. heridate.com sees itself as a service partner for science and wants to support them in any direction and without unnecessary hurdles. All informations and images on heridate.com were created by different authors / creators with different restrictions. Any publication (print or online) of any kind of information given on heridate.com requires a written approval by heridate.com. Such approval can be requested informally by e-mail and will be given in maximum 7 days.
Why doing research in watermarks and paper ?
Not sure about an authorship of an artist or an indicated date of origin?
By using watermarks, interlinkings between different cultural assets become visible and you will get a deeper insight to your research topic.
Why using heridate.com ?
We are here to help you !
By participating in our project you will get the benefit of our experience in watermark imaging and research since 2003! You want to join our heridate-project or you want to be part of the european watermark community ? Please get in touch wih us …