Perhaps a fine point silver permanent marker?

On Sun, Mar 9, 2008 at 12:27 AM, Bonaventure Omondi Aman <[EMAIL PROTECTED]>
wrote:

> Dear Colleagues,
> Do you know any products that would be used in marking tiny black
> histerids
> (1.5mm long)?
> I need to do mating studies between populations of these insects, which I
> cannot sex visually, so I have to pair them randomly hoping some will end
> up
> with potential mating partners, but then I must be able to identify or
> even
> mark populations without killing them first!! The only sexing technique I
> know is by dissection!
> Please help.
> Aman
>

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