I think these are just remnants of times when colors were made of something much less resistant to heat. These days it’s not a problem at all.
I’ve been mixing everything and washing at 90C, and I’ve only had problems once ever, with some green towels which made everything green. Colored clothes are perfectly fine at that temperature.
I had two mishaps a few years ago. Once A blue pant that darkened a whole load of white shirts, another time a red one. The color wore off after a few washes, but I don’t recommend it. Even if most items are fine, just one is enough to ruin a whole load of clothes.
I think these are just remnants of times when colors were made of something much less resistant to heat. These days it’s not a problem at all.
I’ve been mixing everything and washing at 90C, and I’ve only had problems once ever, with some green towels which made everything green. Colored clothes are perfectly fine at that temperature.
I had two mishaps a few years ago. Once A blue pant that darkened a whole load of white shirts, another time a red one. The color wore off after a few washes, but I don’t recommend it. Even if most items are fine, just one is enough to ruin a whole load of clothes.
I still have issues with bright reds, even wearable clothing. Not so much other colors.