Oil-sensitive papers

Sediment deposition. Horizontal surfaces collect particles primarily by sedimentation deposition, sometimes referred to as fallout . These can provide valuable information relating to exposure for horizontal surfaces in the field such as water and ground. Most studies measuring spray performance within the application area, and/or outside this area by drift, include horizontal collectors. The most common types of such collector include flat papers, cards and plates. Water- and oil-sensitive papers have been widely used for looking at the uniformity of spray coverage, coefficient of variation, droplet densities and approximate droplet size within a spray block. 

Oil-sensitive papers can be used for sampling oil-based sprays. These white papers turn black when contacted by oils. 

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