The conductivity of aqueous (distilled and natural water) solutions of fungal melanin (purified and non-purified) has been studied. It has been shown that, in the presence of impurities, the conductivity of solution increases (for the concentration 0,1 wt % about an order of magnitude). On the concentration dependences of the melanin conductivity within the range of 0,0001 to 1 wt. % at least three particular sections have been detected. It was suggested that the presence of such sections is caused by three types of aggregation of melanin molecules: aggregation of several (mostly oppositely charged) molecules under the lowest melanin concentration, formation of nanoscale melanin clusters for the concentration of 0,002 to 0,06 wt. % and formation of micelles, when the melanin concentration is higher than 0,1 wt. %.

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