Staining Indicators 2
Staining Indicators 2 : Yellow to dark brown stains that are caused by the condensation of hot gases, resins and oils on the surface of non-combustible objects (for instance, rocks). The stains often feel tacky to touch and may be covered by a layer of white ash. Stains will appear on the side of the object which has been exposed to flames. Staining can therefore be used to interpret the direction of fire spread. Transition zone An area where the spread of a fire changes direction. Transition zones can be identified by changes in the appearance of indicators. "V" and "U" pattern indicators The initial perimeter of wildfires predominantly driven by the influences of wind or slope will commonly resemble a "V" or "U" shape pattern on the ground. The origin of these types of fire will usually be found towards the point of the "V" or within the cup of the "U", dependent upon the combined influence of slope and wind. "V" and "U" pattern indicators are most easily identified from an aerial or elevated viewpoint.
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