I don't separate darks and colours. I do typically separate reds ( including orange and dark pink ) and whites ( except white socks ).
Also denim lately. This works fine. Has always worked fine for me. If I had a new item of dark I would do a dark load the first couple of times I wash it.
On Friday afternoon when I hung the load I had programmed to end as we got home I thought I detected a faint pink tinge in some of the socks and something that was blue.
Then when I took out yesterdays wash OMG it was pink, no doubt about it as pink as pink could be. Indiscriminately. The darks and school clothes ( thank goodness ) didn't hold the colour.
The only thing the two loads had in common was that I used the pre-set cycle. I don't usually let it run for the full 2 hours 40 as I'm not organised enough for that ; )
I suspect this unassuming brown cardigan, being washed before hitting the charity bag - would you believe, is the culprit for yesterdays pinker than pink wash.
This was a crisp white floral and a black shirt with green and white stripes. Its now pink and olive striped and washed to within and inch of its life trying to get the pink out.
These pyjamas were a lovely light purple
This pastel pink ( Man's ) shirt was light blue.
These socks and hankies were white
As it is overcast these photos do not adequately portray the actual shade of pink here.
There are track pants with pink stripes and other items with slightly altered shades.
Some underwear that was ( I have no idea what colour ) is now orange. Some also are pink.
So maybe I have to rethink my washing strategy. Sigh.
Are you laughing ... despite this being frustrating , I do see the funny side ; )