That's a good idea, but ants detect the pheromone from certain distance, and
if I understood right, in this case the ants only detect if they are on a
saline drop, right?

>
>
> >Do you guys have any other suggestion regarding sensors, other
techniques,
> anything?
>
> Quick cheap guess.... how about using saline drops and a carbon fibre or
thin
> copper brush
> array which detects conductivity change.  Keep things warm and the drops
should
> dry
> out completely and go non conductive again.
>
> Cheers,
>            Robin.
>


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