Back in May I wrote a blog about my experiment to see if polymer clay was light fast. After that I wondered how the colours would fare directly in the sun. If you remember, I had cut three strips from the same spectrum gradient blend of Fimo Professional “True Colours”. This time I used the strip that had been on my wall in a North facing room as the colours had not changed much (I wanted to preserve the control strip which had been stored in a drawer, and compare to the strip that had been sitting inside on a South facing windowsill). This time I left the piece on a South facing windowsill outside for the summer.
From top to bottom: Strip left inside on windowsill for a year, strip kept in a dark drawer, strip left outside for the summer
As you can see, this time there is a definite colour change. The strip has faded overall, but the yellow seems particularly affected. The orange and green (when blending with the yellow) have particularly changed while the others have mostly kept their hue but have become paler.
From left to right: Strip left inside on windowsill for a year, strip kept in a dark drawer, strip left outside for the summer
I am a little disappointed that the colours do fade, although the strip is still nice and colourful when not compared to the original colours. I have seen some lovely garden ornaments made from polymer clay and they withstand the elements very well, but it would probably be best to stick to earthy colours when making something intended to go outside. This way a slight shift in hue would not make a big difference. Perhaps there’s a UV protective varnish that can be used to preserve the bright colours?
Since I’ve only tested one brand of polymer clay here: please let me know in the comments if you’ve had any experience with colours changing (or even better – not changing!).
The short answer is “Probably not and I’m definitely not a scientist!”.
Years ago I did a polymer clay painting that I was really pleased with. I even had it framed and it was on display in an art gallery for several months (possibly over a year). However when I got it back the colours looked strange to me. Sure enough when I took it out of the frame there was a definite colour shift visible where it had been under the mount card. I don’t know if it had been in a window or if it was due to the bright shop lighting, but I was really distressed. I was so distressed that I didn’t take a photograph before trying some remedial actions.
Polymer clay painting by Cate van Alphen
To try and save the picture, I carefully scratched off the surface to blend the hard line where the colour changed. You can still see that the foreground is much more yellow at the bottom. I couldn’t do too much of this as I would have lost all the shadows and details added to the surface. You can see more clearly in the next image where I have layered the front and the back of the picture together (both photos taken in the same lighting right after each other).
Comparing the front and the back of the picture to show colour change.
Because it takes me days to make these paintings, I decided I didn’t want to do any more of them until I could check that the colours would remain as I intended. I couldn’t find any information about the colour fastness of polymer clay, but I did find an article for checking if water colour paints are colourfast. The suggestion was to paint a swatch and then leave it in a sunny place for a year to see if the colours change.
So I made a sheet with a spectrum of colours and cut it into three strips. I made the line wavy so I could fit the pieces together later. I kept one strip in a drawer, one strip on the wall of a room with north facing window and one strip on a south facing windowsill. I don’t know what brands of clay I used for the painting (especially the browns because I blended several scraps to make the colour), but for the test I used Fimo Professional (which at the time was a new product).
From top to bottom: wall, drawer, windowsill
From top to bottom: windowsill, drawer, wall
From top to bottom: windowsill, drawer, wall
Colour swatches for testing colour fastness.
I couldn’t see any change for the strip that was on the wall, but for the strip that was on the windowsill there was some slight fading of the yellow where it mixed with the red (it’s now less orange) and the green seems to have faded overall. The colour change is a lot less that that which was suffered by the painting but it occurs to me that the double glazing of my window may have had some UV protection that the shop window didn’t. I think I need to put the “wall” strip in the garden for a year and see how that goes.
Unfortunately my process was a bit too chaotic to make this a nice (and accurate) scientific test. For a start I didn’t write down the dates for when I started and finished and I think there are several other variations that are worth testing. For example:
Different brands of polymer clay
Colours mixed with white
Black polymer clay
Clay exposed directly to sunlight (outside)
So in conclusion there was definitely some colour fading of the yellow and green. Was it significant enough that I don’t want to make any more paintings? Is it unreasonable to expect no change? Was it less faded than before because it’s a new formula or a different environment or because it’s fully saturated colours?
I don’t know!
I told you I wasn’t a good scientist, but I thought I’d share with you what I have found out so far anyway. Maybe in another year I’ll have some results for how the colour strip fares directly outside. In the meantime please let me know if you’ve done similar tests or if you have better information.
I’m a little bit late posting my colour recipes for the next step in my 2015 Spectrum Year (if you don’t mind, just hop in your time machine and read this last Tuesday). We went away for the weekend and all of a sudden it was time for indigo! I’m beginning to suspect that I could spend a whole year on each palette :o.
These recipes are for Fimo Professional, and the numbers represent percentages. I wrote a blog explaining how I use them for mixing colours.
Mid Blue Grey
65 white
10 true magenta
23.5 true blue
1.5 black
Dark Blue
30 true magenta
70 true blue
Indigo
59.5 true magenta
39.5 true blue
1 black
Chocolate
50 white
17 true yellow
25 true red
8 black
Beige
99 white
0.45 true yellow *
0.05 true green *
0.5 black
* (0.5% mix of 90 true yellow 10 true green)
Light Grey
95 white
1.5 true magenta
3.5 true blue
The colours don’t adhere very strictly to the inspiration palette because I wanted the schemes to play nicely together. I decided to increase the differences between the indigo and the purple palettes so the purples are more blue. I also desaturated the green to a beige colour rather than introduce another green (the ones in the green palette were too bright for the other colours).
Yum, those hints of purple are starting to make me drool :).
A little while ago I tried the new Fimo Professional clay. I got the True Colours pack which included a great colour mixing chart which I imagine is going to end up dog-eared with use.
Wow! The colours are fantastic!
The clay was wonderfully easy to condition, although I did wonder if it would be a bit mushy for cane work. We were enjoying some amazingly* warm weather at the time. Or perhaps it was because the clay was fresher? Either way it didn’t particularly matter for these beads as I was going for a blended tie-dye effect. And I loved the colours so much I decided I didn’t really care.
I didn’t manage to figure out the reusable packaging and ended up with the same torn, flappy mess as before. However I have since found a video which should help 😉
Fulgorine 