Hi, as per the photos, I noticed today a white ring in my distillate syringe, it’s just below the black rubber/plastic of the plunger. I’ve been storing it in cool dry dark place. I hadn’t noticed it before today. All I have done that I can think is I put it in a bag and then in some hot water to make it easier to get out. Some water made it into the bag, was on the syringe. But then would water make a perfect circle? Any help appreciated

Hello,
How do I use the plastic syringe used in dr distillate 3ml rso? It has what looks like a little black cap on it that doesn’t seem to come off. So I twist it harder? Do I cut the top of it off? Sorry for being daft… just don’t know! You can see it on the pic in the item description on their wall.
Cheers all