Dear Rabbi Simon,
I bought an etrog which is quite green (rather than yellow). The dealer assured me it is OK halachically, but I am not sure if I can rely on his advice. Should I take it back and choose another one?
Thank you for your question.
I can validate your caution about relying on the guidance of an etrog dealer, however I am pleased to confirm that green does not detract from the halakhic hidur of an etrog. You can encourage it to turn yellow by placing it in a drawer with an apple or two, if you like.
Rabbi Rashi Simon