Were anthrax spores present, he said, the liquid would turn yellow in a day or two.
Authorities want to preserve as much of the anthrax spores as possible for their research.
The buildings were shut down after anthrax spores were found, mostly around mailrooms, in October.
Anthrax spores were also found in a military building that handles mail addressed to the White House .
Along the way, anthrax spores leaking from the letters contaminated post office buildings in Washington and New Jersey.
Anthrax spores are formed by anthrax bacteria that occur naturally in soil in most parts of the world.
Five people, including two postal employees in Washington, died after inhaling anthrax spores.
Although vaccinated monkeys did not die from the disease after inhaling anthrax spores, they were still ill for two weeks.
Authorities said they were checking whether an air pressure machine used to clean mail sorters may have spread anthrax spores.
Letters containing anthrax spores were sent to American senators and news outfits in autumn 2001, killing five and infecting seventeen.
Those who have tested positive for exposure to anthrax spores have been quick to say that they are taking the drug.
The envelope, which was opened in the lab, contained 23, 000 anthrax spores and was postmarked October 9 in Trenton, New Jersey.
CNN: Anthrax suspect, scientist, kills self as FBI closes in
Delivery had been suspended for three months after an aide to Senate Majority Leader Tom Daschle opened a letter containing anthrax spores.
As investigators struggle to find the source of the outbreak, the Mirror reveals that Osama Bin Laden bought anthrax spores by mail order.
On that date, a letter containing anthrax spores was opened in Senator Daschle's office, exposing dozens of congressional workers to the deadly bacteria.
More anthrax spores have been found in the offices of two Democratic senators, Edward Kennedy and Christopher Dodd, but not enough to require medical treatment.
People are also concerned that their mail could have come into contact with the anthrax spores by touching the contaminated letter or machines that it had passed through.
Spores can live in the soil for years, and humans can become infected with anthrax by handling products from infected animals or by inhaling anthrax spores from contaminated animal products.
But this form of the disease is usually fatal as the inhaled anthrax spores began producing toxins that kill tissues in the chest cavity and cause bleeding in the lungs.
When you're exposed, that means you may have the spores -- the anthrax spores that they have found in nasal passages, that they found on the computer keyboard, for example.
The decision to vaccinate 2.4 million troops was taken after UN weapons inspectors operating in Iraq found that the regime had stockpiled 8, 000 litres of anthrax spores before the 1991 conflict.
The president said that health officials were acting quickly to distribute antibiotics for those who may have been exposed to the bacteria, and the government is testing facilities rapidly for anthrax spores.
This discovery lends credence to the theory that whoever mailed the finely milled anthrax spores -- known to be of the Ames strain -- has a current connection to a sophisticated laboratory.
The others are not U.S. antagonists, like Russia, some of the European countries, and the U.S. So it could only be that Iraq is the state behind supplying that expertise, which is the same thing as producing the anthrax spores.
Demand for Cipro seems to be increasing daily as the anthrax scare spread from postal workers, two of whom have died from the disease, to the White House, where no one has yet tested positive for exposure to anthrax spores.
Tests carried out by the US Army's Medical Research and Materiel Command Center on the anthrax spores sent to the office of Senate Majority Leader Tom Daschle and the New York Post show that the spores were not mixed with Bentonite.
You can have spores of anthrax, the bacteria, but you may not have full-blown infection.
There have been no arrests in the case, which started after someone sent letters laced with spores of deadly anthrax to congressional offices and several news organizations.
CNN: Anthrax suspect, scientist, kills self as FBI closes in
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