Unravelling textile testing - Colourfastness
Unravelling textile testing - Colourfastness
Colourfastness is one of four key topics (others include Abrasion Resistance, Pilling, Seam Slippage) that we are covering to provide some background as to how we test and why.
Test results provide us with critical information about textile’s durability and suitability for certain applications. We externally test all James Dunlop and Mokum textiles in Melbourne at a highly reputable laboratory who are amongst the most conservative and stringent in the world, due to the extremely harsh environmental conditions we face here in Australia and New Zealand.
We have gathered a number of frequently asked questions relating to colourfastness so we asked our Mokum studio designers Stephanie Moffitt and Annie Moir to share their expert knowledge.
One of the most important textile tests is that of colourfastness.
Simply put, a colourfastness test measures how well a textile will resist or withstand fading. Fading typically means a change in colour which may be a change in hue, depth or brightness of colour. We perform a range of different colourfastness tests when developing a new textile, we test its resistance to fading against UV light, as well as washing / dry cleaning and also rubbing.
Can you briefly outline the colourfastness to washing/ laundering test?
Colourfastness to washing and/or dry cleaning measures a fabrics ability to withstand fading or colour loss from laundering. The test replicates specific cleaning methods then measures any colour loss against a set of five grey scales, creating a result (1 being least colourfast and 5 being most colourfast). In this instance, a result of 4-5 is the result we strive for.
One question pops up a lot, if a product is machine washable can it be spot cleaned?
We would always approach spot cleaning with water or a cleaning product with caution. Most of our washable textiles are rating as delicate or gentle washing which means a delicate setting and we would prefer a delicate washing liquid. Whereas spot clean tends to be more localised and more aggressive. If spot clean is needed always first try a dry white clean cloth, to reduce any colour loss as this often can remove a stain.
Can you briefly outline the colourfastness to rubbing test?
Colourfastness to rubbing, or commonly known as ‘crocking’ measures fabric resistance to colour loss when subjected to rubbing or friction from another fabric. This is particularly relevant for upholstery textiles – you can imagine wearing white pants and sitting on a dark coloured sofa, you’d want to be confident that when you stand up your pants haven’t changed colour.
With this test, a white cloth is used as a standard abradant, and rubbed against the test fabric in both in both dry and wet conditions, with wet being more severe. Any colour transfer onto the white cloth, and colour loss from the test fabric is analysed and measured against a set of 5 grey scales (1 being least colourfast and 5 being most colourfast). The result we receive from the lab helps us to determine the recommended usage for the upholstery fabric.
What's your favourite recipe for courgettes?
Kia ora neighbours. If you've got a family recipe for courgettes, we'd love to see it and maybe publish it in our magazine. Send your recipe to mailbox@nzgardener.co.nz, and if we use it in the mag, you will receive a free copy of our January 2025 issue.
scumbags
There are some really awful people around at the moment. This is what happened on Sunday.
We live in Hinemoa Street opposite the Waiwhetu Stream. At around 3.40 in the afternoon I was looking out my window and saw a car pull up and start to feed the geese and ducks out the window. Then The passenger an asian man jumped out and threw himself onto a goose. he picked it up and put it the boot of the car.
I immediately ran over and stood in front of his car to stop him moving I also called my husband to help. A lovely man was riding his bike and saw it and stopped to help me. The driver tried to drive into me but I didnt move. He tried telling us it was his pet. These are wild geese.
They had a cage in the boot and some wire all ready to catch the poor bird like they have done it before. My husband took the bird from the car and released it. I then moved out of the way and after lots of abuse from the driver they drove off threatening to come back and get more.
No one should be allowed to take these beautiful birds and certainly not like this. they are all starting to have wee babies at the moment the whole thing was so upsetting to me. Another neighbour further down the road also saw it all happen.
Please keep a look out for this car and if you see them by the stream go over and watch them lets all stop this happening.
The tiger who came to tea
Trays are such a useful item to have in the home – they are obviously great for serving food and drinks, particularly breakfast in bed! Find out how to create your own with Resene wallpaper and Resene Colorwood wood stain with these easy step by step instructions.
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