Ok, Help..... I worked till the wee hours and the liquid still does not work
yet (one thing at a time.... :-), anyone see something wrong with the code?

#declare tube_rack=
difference{
union{
        box {   <-8,-0,-3>
                <8,2,3>}
        box {   <-8,7,-3>
                <8,8,3>}
        cylinder {      <-7,0,2>
                        <-7,9,2> .4}
        cylinder {      <7,0,2>
                        <7,9,2> .4}
        cylinder {      <-7,0,-2>
                        <-7,9,-2> .4}
        cylinder {      <7,0,-2>
                        <7,9,-2> .4}  }
union{
       #declare counter =0;
      #while (counter <5)
        sphere { <-6+(3*counter) ,1,0>   1.1}

        cylinder {      <-6+(3*counter),1,0>
                        <-6+(3*counter),15,0> 1.1  }
        #declare counter= counter+1
      #end}}
#declare liquid_color= rgbf <1,.6,.6,.9>

//declare the final filled rack

#declare filled_rack=
merge{
object {tube_rack texture{DMFWood6 rotate 25*y scale 6}
        finish {reflection 0.0 ambient 0.4 diffuse 0.2 phong 0.2 phong_size
50}
        normal {dents 0.2
                scale 0.2}}
#declare counter = 0;

#while (counter<5)
        object {test_tube
        #if (test=1)
                        texture{pigment{rgbt <0.8,0.8,0.8,0.6>} finish{phong
1}}
                #else
                       texture {
                        pigment { color rgbt <1,1,1, .98> }
                        finish {
                                 specular 1
                                 roughness 0.001
                                 ambient .2

                                 diffuse 0.2
                                 reflection 0.1
                                 phong 0.9
                                 phong_size 100}}
                      interior{ior 2 fade_distance 2 fade_power 2 caustics 4}
                #end

                  translate <-6+(3*counter) ,0,0>}

        object {liquid
                                 #if (test=1)
                        texture{pigment{rgb<1,0,0>}}
                #else
                        texture{
                                pigment{color 1.9*liquid_color }
                                finish{reflection 0.4 ambient .8 diffuse .5
phong 1 phong_size 200}}
                                interior{ior 1.33 caustics 4}
                #end

                                translate <-6+(3*counter) ,0,0>}


#declare counter = counter+1 ;
#end
}

>

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