To remove organic stains, apply a paste of whiting mixed with 20 percent hydrogen peroxide solution (hair bleach).

Use a solution of ammonium sulfamate powder, an herbicide, (one ounce of powder to a gallon of water) to remove organic stains.

Surface artifacts found at the site include chipped stone points and tools, ground stone tools, fire locations and organic stains.

Look for areas with heavy stains (rust, organic or mildew stains or heavy deposits of grime) or efflorescence (white powdery deposits of crystallized salts) on masonry surfaces.

The company, which began in the suburban Denver garage of its founder, Max Appel, in 1986, at first used trade shows and word of mouth to sell its products, including Orange Clean, a liquid-spray cleaner for hard surfaces, and OxiClean, a white powder that oxidizes and breaks up organic stains.

Simple Solution, a spray stain remover, promises a quick fix: the manufacturer says this water-based cleaning fluid will remove most organic stains - wine, berries, even blood - from fabric or carpet that can be cleaned with water.

From his box Graham took the police photographs,lab reports on the individual blood and organic stains in the room and standard comparison plates of blood-drop trajectories.

To remove organic stains, which usually range from yellow to rose in color and are caused by tea, coffee, flowers, fruit, tobacco, paper or similar substances, pour hydrogen-peroxide solution of hair-bleaching strength on the stain and add a few drops of household ammonia to the peroxide with an eyedropper.

Synthetic and organic fluorescent stains have therefore been developed to label such compounds, making them observable by fluorescent microscopy (Video 2).