Dark stems while curing

Great first harvest of Northern Lights and has been in jars for about three weeks. Noticed stems connected to some very nice buds has darkened. I followed proper curing to this point, but still worried about missteps. No need to burp jars anymore at this point correct?

Its a good thing. You know they are about ready now. Its just the chlorophyll leaving. I kinda also use this for a good marker of when cures about done. You know if you break a piece open and the stem is still light green it needs to be cured more.