Brent Krueger 2x2s - Paper dust?

guysmy · November 18, 2004 10:10AM

Brent Krueger doesn't mention the brand of the 2x2s they sell. I purchased a TON of them. When I hold them up to the light I can see quite a bit of dust in there (just enclosed them recently). I'm not sure if it's paper dust, dust from my house or combination of both. Are my coins safe in these things?

Russ · November 18, 2004 10:13AM

Coins are fine. It's not uncommon for there to be little paper particles on the glassine of 2x2's.

Russ, NCNE

solid · November 18, 2004 10:16AM

I always keep a can of compressed air nearby to blow off 2x2's before
putting the coins inside - works great!

Ken

guysmy · November 18, 2004 1:57PM

ttt

NJDrew1 · November 23, 2004 12:15PM

We have them manufactured in Canada. Paper dust is common on 2x2's as a result of the cutting process. While the hydraulic cutter clamp compresses the load of mylar sheeted boards, and keeps the stack pretty tight, and the cutters are equipped with vacuums to reduce the amount of paper dust. While the holders are manufactured in a controlled environment, there's no way to eliminate the dusting issue entirely. It's always helpful to keep a can of compressed air to blow off any paper dust that's attracted to the mylar.

--Andrew

magikbilly · November 23, 2004 12:19PM

Hi,
I have read posts here advising against the use of compressed "air" on a coin (in the context of drying a dipped, neutralized and rinsed coin) as it may leave some residue or other behind. Does anyone have any info on this and would the same hold true for the 2x2's?

Best,
Billy

solid · November 23, 2004 12:56PM

I've no concrete evidence, but have used compressed air cans to blow off
2x2's for years with no harm, including with proofs that have just had a
fresh dip - the mirrors are as nice now as the day they went in.

I haven't used canned air to dry coins, and wouldn't - there is always the
possibility of shooting liquid, a minute particle, or the little straw at your
coin!

Ken

NJDrew1 · November 23, 2004 1:20PM

Billy -- I'll leave it up to the chemists in the group to provide a more-detailed analysis. Compressed "air" is not really air. It's compressed gas. In many dust removing products, tetrafluoroethane is commonly used. It's inert and has a neutral ph. I've been using it to dust coins since its been on the market, and have yet to find any damage to the coins its been used on. I haven't seen and written documentation that would lead me to believe otherwise.

The only issue I can see with the use is if the can is turned upside down and the gas is expelled in a liquid state causing the surface of the coin to freeze. The coin would have to be returned to room temperature before it's put into any time of sealed container so that condensation doesn't form inside of the container.

magikbilly · November 23, 2004 1:49PM

<< <i>Billy -- I'll leave it up to the chemists in the group to provide a more-detailed analysis. Compressed "air" is not really air. It's compressed gas. In many dust removing products, tetrafluoroethane is commonly used. It's inert and has a neutral ph. I've been using it to dust coins since its been on the market, and have yet to find any damage to the coins its been used on. I haven't seen and written documentation that would lead me to believe otherwise.

The only issue I can see with the use is if the can is turned upside down and the gas is expelled in a liquid state causing the surface of the coin to freeze. The coin would have to be returned to room temperature before it's put into any time of sealed container so that condensation doesn't form inside of the container. >>

Hi

thanks - I know it is not air - that is why I put it in quotes and asked the question. It was here at CU that I read about the potential for damage from residue. I can't find the thread

tetrafluoroethane, according to some online sources, is indeed as you describe. I did see some information that all canned "air" will deposit moisture and contaminants to varying degrees. Other "airs" that are of different compostion/or combination of contents are unnacceptable for a lot of uses from I saw in a quick look. I will research more

Thanks!
Billy

19Lyds · November 23, 2004 4:30PM

<< <i>Hi,
I have read posts here advising against the use of compressed "air" on a coin (in the context of drying a dipped, neutralized and rinsed coin) as it may leave some residue or other behind. Does anyone have any info on this and would the same hold true for the 2x2's?
>>

No info on the compressed air but for all my 2x2's I use the drapery brush on my vacuum cleaner to get rid of the dust. The bristles do not scratch the plastic and it seems to work great! Don't know why I didn't think of this years ago since I use that vacuum for darn near everything!

tsacch · November 23, 2004 7:50PM

If you use a can of compressed air, its just that...compressed air....if you use an air hose from a garage, or gasoline powered air pump, you run the risk of putting oil on your coins as well as spent gases from the engine that was used to make the compressed air....as well as water vapor. Most good auto shops use filters for their air lines.....so stick to the can in an enclosed clean area.....dont put your coins in 2 x 2's at the gas station at Hamads Friendly Mart.

dorkkarl · November 23, 2004 8:56PM

compressed air is a NECESSITY for any coin collector, imo.

K S

ozzysdad · November 24, 2004 12:25AM

My experience is to take the 2X2 hold it at the center fold line and thump it a few times , like when you used to thump knuckles and for lack of a better description, "Flick it like a Bugger"

usually that thump or flick not only breaks the static cling, But gets all of it off.

LanLord · November 24, 2004 12:40AM

I would sincerely recommend you make sure to remove the dust before putting your MS or PR coins in a 2x2.

I have reuined a nice 1995s silver Kennedy by allowing the dust to remain in contact with the coin, it ended up putting marks on the otherwise pristine coin.

Blow it off, wipe it off, do what ever you have to do, just don't leave it on the the inner surface.

Shamika · November 24, 2004 12:59AM

Dust on coins can never be a good thing. At the very least, dust particles on a coin can provide a surface between which moisture can accumulate. This can in turn lead to spotting.

Why take the risk?

Brent Krueger 2x2s - Paper dust?

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