Patent ID: 8293135

Claim:
A suspension, comprising: a fluid host that is a mixture of: 94 to 99.5 wt % of a non-aqueous fluid medium having a dielectric constant value ∈, where 1<∈<7, a conductivity value σ, where 10 −9 >σ>10 −7 Siemens per meter (S/m), and a resistivity r, where 10 7> r>10 10 ohm-meters (Ω-m), and which is optically transparent in a selected wavelength range Δλ; 0.0025 to 0.25 wt % of an inorganic chloride salt; 0.0475 to 4.75 wt % water; and 0.25 to 2 wt % of an anionic surfactant; and 1 to 5 wt % of PCLC flakes suspended in the fluid host mixture.