...But this does what you want:

#declare Blue_gel =
box {<0, 0,0 >  <1, 1, -.01 > hollow
   texture {pigment {rgbt 1}}
   interior {
     media {
       scattering {1, <1,0,0>*1000}
     }
   }
}

#declare Yellow_gel =
box {<0, 0,0 >  <1, 1,-.01 > hollow
   texture {pigment{rgbt 1}}
   interior {
     media {
       scattering {1, <0,0,1>*1000}
     }
   }
   translate <.5,.5, -.5>
}

Blue_gel
Yellow_gel

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