Instruction: Given a question and the related document, and generate the answer to the question based on the information provided in the document.

Input:
Question: carbon black?
Document: Read a lot of reviews concerning the black carbon dust. I tried on the pen on a regular camera lens before touching my expensive ones. Worked great.
I have not used one up yet. I thought the camera one would of been empty of carbon a long time ago but it keep putting carbon on the black cleaning head to clean all of the lenses. This is a really great product for the money. I never worry about scratches using the pen.
(customer image, B. Cooper).What all this essentially means is that Carbon black IS safe to use on any optical surface and while it may smudge on your hand, the Lens Pen is designed to clean glass not skin! I have not seen any black smudges in pictures I have taken after cleaning my lenses with the Lenspen.
The most interesting aspect of the Pen is the "Carbon black" tip (see my close-up picture in the customer images) that has caused some controversy. Some people claim it leaves smudges on their hands (check out customer images) meaning certainly that "smudges are left on their lenses" right? Wrong. According to an official statement by Nikon, "Carbon black has been found to be a [not THE] most suitable material for cleaning optical surfaces".
The Lenspen rep stated that there is a cleaning compound inside the cap which coats the cleaning tip with something like a fine carbon black powder and that is what makes it so effective in cleaning the lenses of oils and dirt without scratching.Of course the fine brush at the other end is used to brush off the large grit and damaging dirt before you move to the cleaning tip.All in all, this is a good part of a more complete system.
I watched the video, read the instructions, and this seems like it should be awesome, but unfortunately results varies drastically. The felt tip came off after 3 Lenses cleaning. The cranking cap that recharges the carbon seems like it contains nothing on the other end, touched it with my finger, there is no carbon on the felt. If there were, my finger should have black smudges, but it didn't. So with all that said, all three Lenses I cleaned with, didn't get cleaned at all.
Use a blower for the removal of non-sticky debris: I use theGiottos AA1900 Rocket Air Blaster Large (Black). Do not rely on your breath because you WILL eventually spit.2. Use Lens Pen's included brush for the removal of sticky solid debris.3. Use Lens Pen's carbon pad for the removal of liquid stains or anything the first two methods did not.4.
The first time I used one of these I thought something had gone wrong because of the black carbon dust left on the lens. I then read the details on how the system works and the black dust is the cleaner. The brush is how you get the dust off. This works well for most general purpose cleaning. If you get something sticky on the lens, you want to get it off some other way first, this is just for getting rid of a smudge or finger print or similar.
This is most useful because it's there when you need it. The carbon-implanted disc and the brush make short work of grease and dirt.
This pen does what's it's supposed to do. The Brush is fantastic. And the pad works fantastic. It makes fingerprints disappear. For all the negative reviewers, go read how carbon cleans the pad/lens and you'll see it was user error.
Answer: Purchased the cleaning pen on 5/16/2013 and 5/20/2013 total of 4 pens Fulfilled by Amazon. These cleaning pens came on time. But it was not an original Nikon cleaning pens. I called Nikon they told me that there should be a printed website on the pen. (www.nikonsportoptics.com). I was told to return them and buy them at (bandh.com). I have used these pens for five years and had six of them, all had Nikon website on it. And yes it has black carbon on the tip of the pen.