Only a small part of the leaf is the vein, so the vein being red wouldn't make the powder red, red vein kratoms are green unless they've been fermented or you've been sold powder with loads of stem and vein in and barely any leaf ... Plus its worth noting that the veins darken on older leaves, the older leaves are more mature and tend to have a higher concentration of 7-OH mitragynine and mitragynine, I've had reds from some companies that came (red) brownish and you could literally taste the