The most common reason this occurs is a phosphorus deficiency.
12+ Tomato Leaves Turning Purple. This saliva contains a toxin that causes veins to turn purple. Symptoms include stunted growth, foliage that turns blue/green or purple.
Tomato Leaves Turning Yellow Why Tomato Plants Leaves Turn Yellow from plantcaretoday.com
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Does the purple leaves, veins and stems ever return to normal green color? After reading up on what causes the leaves of tomato seedlings to turn purple, i learned it was a phosphorous deficiency caused by (among other things) cool temperatures. What soil did you plant in? To confirm psyllids, check the symptoms begin with lower leaves turning downward.