In general it’s best to wash your dark colours separately. But it’s worth knowing the clothes’ (especially new ones) are colour fastness before putting them in with a regular wash. That way you’ll avoid dyes running into other clothes, leaving them an undesirable – and often indescribable shade! So check the washing care label, and do this easy test for colour fastness.
Dampen a small area of hem or inside seam with water. Iron a piece of white fabric or kitchen paper on to it. If the paper soaks up any colour, your garment isn’t colourfast, so should be washed separately
Of course there are much more professional methods with sophisticated machines that we test our fabric commercially.
Procedures of Fastness Measurement
A Specimen (Lab-dip) in contact with specified adjacent fabric or fabric is laundered, rinsed and dried. The specimen/composite sample is treated under appropriate condition in a chemical bath for short time. The abrasive action is accomplished by the use of a liquor ration and an appropriate number of steel balls. The change in color of the specimen (Dyed Sample) and the staining of the adjacent fabric is assessed by recommend Grey Scales (1-5).
If you don’t want to be bored down by the technical details above, just know that colour fastness is rate based on the Grey Scales of 1 – 5, with 5 being good and 1 being poor. So just ask your fabric supplier on which scale the fabric is at and that will tell you the fastness.
Fabric we use are all with Colour Fastness rate at 4~5. So you don’t have to worry about colour run with our products even if you wash when it’s brand new!
Also our printing ink is properly heat cured to ensure the fastness that your logo print will not run.
We use only Madeira thread (a reputable German thread manufacturer http://en.madeira.de/threads/polyneon-polyester/) which also assure the colour fastness of your embroidery.
Colour Fastness vs Bleach
Even if colour fastness is rated at 5, it does not mean you can bleach the item! Simply because bleach is a chemical compound used to whiten fabrics. Colour fastness rating are understood for normal washing in accordance to the care label.
So say your polo t-shirt is white but you have a red embroidery logo, can you still bleach your polo? I’m afraid not. So do check your clothing for any other coloured decoration or labels or accessories before you put it into the bleach.
So how do I wash non-colourfast items?
Non-colourfast items should be washed separately in cold water and rinsed immediately without soaking. Dry cleaning is safer for garments that lose a lot of colour, but check the care label first.
What should I do if dye runs into other clothes?
If a non-colourfast item accidentally slips into your wash you could try using a reversal product available in your market.
If an article washed in your machine has released a lot of dye, put your machine on an empty wash cycle before doing the next load. This will stop the loose dye running into the next wash.