Daylight UV substances will fluoresce under normal sunlight and are
highly visible.
 
Our UVHG fluorescent dye is a highly water soluble, highly stable, extremely
fluorescent compound that will self-fluoresce in daylight.  Tiny amounts
will instantly turn water a bright green shade.  UVHG is stable in a
variety of hostile solutions such as high and low PH conditions.  For
instance, UVHG will not degrade in a 50% potassium hydroxide.  UVHG is
non-toxic.