For testing the colourfastness to ironing, iron the samples with a very hot iron. Let the samples be cooled. After the sample has cooled, compare both the original fabric and ironed fabric. If the ironed fabric changes colour it is said to be not colourfast. If the colour is unchanged, the fabric is fast to ironing.
To test for fastness to steaming, the test sample need to be placed between the folds of a white cloth and steam it over a tea-kettle or hot steam iron. If the fabric remains unchanged the colour is said to be fast and no dye can be seen on the white cloth.
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