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This is most likely from the Metamucil which contains dyes that can discolor feces. Also when feces comes through the digestive system more quickly that it was once accustomed to, the color of the bilirubin (a normal component) doesn't have a complete chance to develop into the darker brown color of feces. It can be anywhere from yellow to pale green.
It isn't anything to be concerned about. I'm happy to hear you've found something to control the constipation.
You're so very welcome!