I bought a box of cartridges of the new Golden Yellow ink two weeks ago Sunday, at the Chicago Pen Show, from an authorized dealer. Golden Yellow is a new ink this year, and mine seems very new. My box has an expiration day of May 2018. The ink cartridges have been in the box since I bought them, which again was all of 15 days ago. Today I took out a few, and I noticed something strange floating inside. Looking more closely, it appears to be SITB, and it's in every single one of the eight cartridges, all sealed. I'm not really figuring out how to upload photos here these days, but I think I can attach one. There are more photos here, for those interested. But I wanted to let folks know to check Golden Yellow ink cartridges before using them. Maybe it's an isolated problem, maybe not. Tomorrow I'll have to call the retailer and see if they'll give me a credit or exchange. Montblanc USA wouldn't help me out there, and frankly I'm disappointed. It's just a $5 item in the first place, and I spent a lot of time calling Montblanc about it. But lesson learned.