I am writing an essay describing the effect of water to aerosol scattering coefficients.
Water will increase the size of particles, thus increase scattering coefficients; while it may also reduce the refractive index which could decrease scattering coefficients. I want to summarize this phenomenon as:
The effect of water to aerosol scattering coefficients is dual-edged.
I am not sure whether the word 'dual-edged' is used correctly and particularly looking for a properer replacement.
What would be a nicer way of saying this?