Love RED Hate RED

Somehow my clothes (especially white) have a special affinity for red stains, though not the type seen above, but from the ones they are soaked with for washing. It's been happening for years! Whenever I feel I have successfully understood the science of staining, I am taught a new lesson! And the tuition fees are quite high sometimes, considering the 'value' of those clothes. The worst thing is, these laundry accidents happen only after I have worn them for some time and received some compliments! Till that time both the stainer and stainee choose to stay away from each other. And then one fine morning, a new discovery is made. Somehow in every such accident there is only one stainer (mostly red) and only one stainee (mostly white!). All the other not-so-important clothes in the bucket just remain spectators, happily swimming and (secretely) leaving their dirt in the brutal red liquid at the crime scene (bucket). And there I sit, heavy-hearted, segregating the criminal, victim and the spectators in the bathroom, thinking again, someone has shown their real colour today!
:(
Ok, can someone tell me why only a particular fabric gets stained and not every fabric? Also as I have observed, stain is received only from the direct contact with stainer (छूने से फैलती है types) and not from the coloured water in bucket. Why so?
And to all my friends in Apparel, textile and fashion industry, isn't it possible to provide a piece of same fabric with every garment you buy, for stain testing at home?
Found this interesting site/blog in this reference. It has some nice pictures too!