This lavender field was painted on damp silk using Inktense blocks, It is approx 4in square
The manufacturers say these can be used on silk and when dry are permanent. Silk paints are usually fixed by ironing. I ironed this.
Below is my sample to test the colours to see if they are colour fast when washed.
I will also test the colours to see how light fast they are but that takes time.
The sample on the left was cut in half and the right hand side washed. The right hand photo shows before and after washing. I didn't notice any colour running in to the water though the sample on the right has gone a little lighter.
I also tested some other aquarelle sticks on damp silk. I didn't cut these samples in half but just washed the right hand side of each.
D Daler Rowney's Aquatone
CD Caran d'Ache Neocolour
With these I could see the colour coming out into the water. The manufacturers of these makes don't claim that they are colour fast.
The Inktense blocks seem to have done the best on washability.
I am not sure that I would use any of them for silk scarves.
They would be good for making silk painted cards or small paintings and are more portable for working outside or on holiday. They would be ideal for groups of children to use.