Yep! Mixee... Mine are starting to rust! I guess there just made out of metal. I they are made in stainless steel too. Next time I'm at my cake store I'm gonna have to buy a few more. I haven't done many flowers lately I like to use them as a heating core.
I've had one to get a little rust on it. I just took a small piece of steel wool and rubbed on it to get the rust off... looked like new again... I've never had one to turn black though.. I'm not sure what to say about that.
The welding on the rose nails is what rusts, and unfortunately, it does leave those greyish black stains on it. Use some Soft Scrub if it really bothers you; otherwise, it won't hurt anything. I've got one that's done that, and it hasn't caused problems yet.
Illy
. I don't do my pans that way but tips, couplers and nail I throw'em in. 
Your're not alone... I just had to buy two more this week!
I haven't had a problem with rusting at all.....but it could be because I handwash them in hot soapy water and IMMEDIATELY dry them.....
I did have a #16 tip rust on me.....it actually got dropped into the garbage disposal and mangled, so I put it in the soap dish next to the sink so I would see it and it would remind me that I needed to replace it.....2 days later it was a rusty mess!
I have the same problem with some of my flower nails and tips turning. I hate it because it looks odd from the rest. Tend to skip over them for the nice shiny ones.
That is strange about the #16, I soak my tips for up to 2 days at a time and I have not had any of them rust...I assume it is because there are no seams?
Who knows.
Im thinking that when it went it got caught in the garbage disposal, the blades chewed through whatever coating they put on the tips to make them rust-proof!
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