By Mark Jaffe
The Denver Post

Here is the dilemma with the fracking fluids used in oil drilling:

One ingredient found in some of the liquids is aldehyde -- which gives cilantro its fragrance and is also in formaldehyde.

While other ingredients in the fluid include more-detailed explanations, when it comes to the aldehyde and some other components of the fluid, that data is simply listed as "Confidential Business Information."

"You'd want to know if they're putting an herb or a poison down an oil well near your house," said Mike Freeman, an attorney with the environmental law group Earthjustice.

The Colorado Oil and Gas Conservation Commission is set to hold a hearing Monday on a proposed rule requiring disclosure of the chemicals in fracking fluids.

A key battle at Monday's hearing will center on the oil and gas industry's use of "trade secrets" to limit disclosure for some of those ingredients.

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