© Site and most content copyright to Peter Weatherill 2017  Some content copyright to other authors as identified
COLOURED PENCIL TOPICS
BRANDS
LIGHTFASTNESS The Judith Crown GROUP Tests
NEWS AND DIARY NEWS AND DIARY
In addition to the test results on the previous page which compares results for colours within a brand, we also show a range of colour samples where coloured paencil samples have been subjected to the same 14 to 15 week exposure to strong sunlight. In this case a set is displayed showing a colour choice and a range of brands that line up with that colour. In this way you can see the way brands differ a great deal in the way they perform in strong light, with some brands fading a great deal more than others. Once again, the test results shown are representative rather than comprehensive
In June 2018, Judith Crown passed on her lightfastness tests to Pencil Topics for publishing on the Web.   Judith is an experienced Coloured Pencil artist and a Gold Signature Member of the UK Coloured Pencil Society ( UKCPS ).  Judith has had a long standing interest in the problems of fading colour and she looks at the testing, not from a scientific point of view, but from the point of view of a practicing artist who wants her work to last and needs to identify the colours in her palette that are most at risk from disappearing. These tests have been ongoing for several years and the tests have been refined over that time, but the basic principle is unchanged….  namely that each colour from a pencil set is repeated three times and one set is retained as a control in a dark folder.  The second is treated with Winsor & Newton Fixative  and the third is left as it was laid down on the paper.   The second and third sets of colour are then exposed to strong sunlight.   ………….. AND THIS IS THE UNIQUE FACTOR OF THESE TESTS. They do not rely on laboratory testing with artificial light in highly controlled conditions, they rely on basic tests in very strong and continuous sunlight. The samples are displayed facing the sun in Israel and left for a period of 14 or 15 weeks in the strong rays.  This is the equivalent of several years of exposure to sun in the UK.   It might be argued that this is an extreme test, but all the brands are treated in the same way and the results are shown here to demonstrate the need for careful selection when chosing your manufacturer and brand.   The samples were done over a period of more than a year so the presentation of the results varies.  The sunlight will have been similar and method was identical, however. Scanning settings are uniform and the sample images have not been adjusted.  The scans are at 300dpi with the samples treated as photos. THIS SECOND PAGE OF SCANS has the results grouped by colour.    The sets were made up using a fairly random collection of coloured pencils owned by Judith Crown.  There are old brands, inexpensive brands and fairly new ( and expensive ) brands. Not all the examples are to be easily found and some ( like Derwent Signature ) have not been around for several years
The first column in each scan is the original sample which was protected from the light the second column is usually the untreated sample which was displayed to strong sunlight      ( if it isn’t there will be a note to make this clear ) If there is a third column, it will usually be the sample fixed with Winsor & Newton Fixative before the sunlight treatment.       This can act as a protection as you will see, but note that it doesn’t always work ! June 2018
For Example This is a set of both wax type and watercolour pencils all used dry Some are brands you may never have heard of, but all the major brands are represented Whilst you might well expect some of the cheaper and unknown brands to fade quickly, it is surprising to see some major brands fall at the same hurdle.  The strips were prepared and exposed at the same time so there is no difference in the amount of light or the duration of the test. The third result is the one fixed with W & N fixative
BRAND TEST RESULTS LINK
SELECTION 1    -       REDS & VIOLETS
SELECTION 2    -       GREENS
The test result strips below suffer from a reduction in quality when posted to the internet, making them difficult to read the text. The solution has been to progressively load PDF files for each test set and these can be downloaded by clicking on the link beside each test.  Note, it may take a little time for some PDF files to download. Not all tests have been transferred to this system yet
The test result strips below suffer from a reduction in quality when posted to the internet, making them difficult to read the text. The solution has been to progressively load PDF files for each test set and these can be downloaded by clicking on the link beside each test.  Note, it may take a little time for some PDF files to download. Not all tests have been transferred to this system yet
SELECTION 3    -       BLUES
SELECTION 4    -       ORANGES & YELLOWS
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