m0useanswered grow question 6 months ago Not all purple strains turn purple either.. Fast Buds blackberry auto was like this.
Some of the plants where only hint of purple or none at all. others where dark purp.
It was a very tasty strain to grow. Loved its smells.
Like others have said almost all seedbanks have purple lines, just pick a brand you like and go from there.
Good Luck!