Appendix E

Solid tracers

pliolite particles (polyvinyltoluene butadiene)

solid white resin

• insoluble in water
  
• exhibit high degree of reflectivity
  
• ground to 10mm - 200mm diameter particles
  
• manufactured by Goodyear, Ohio
  

polystyrene

• small spherical beads (0.1mm)
  
• density exceeds the density of water
  
• can be painted
  
• manufactured by Bangs Laboratories, Inc. Indiana
  

aluminum flakes

• non-spherical
  
• highly reflective
  
• density close to that of water