Please be advised that a noticeable taste of blood is not part of any test protocol but is an unintended side effect of the Aperture Science Material Emancipation Grill, which may, in semi-rare cases, emancipate dental fillings, crowns, tooth enamel, and teeth.
You could decompile any map from the game and find the particle name in the info_particle_system entities near the fizzlers.
Or open one of portal's .pcf files and extract the name from there. It's probably the cleansers.pcf
EDIT: NINJA'd AGAIN