Wash colours separately

This garment is undergoing its THIRD hand washing and is still bleeding dye.
100% cotton, made in India, sold by M&S.

In a previous life I spent several years working in a textile research institute
(no, I was not committed to an institution, although some might think so).
Then I spent several years in the industrial/commercial textile world selling chemicals, dyestuffs and related machinery.

To think that 50 years later, the art of dyeing seems to have moved on very little from colouring the emperor's clothes using snail shells.

I think the M&S Quality Management team and the dyer need to get together bleeding quickly.