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Michele, precisely what sort of "problem" are you hoping to solve?
Siccatives are invariably linoleate metal salts. While they can accelerate drying time, they can't properly be considered "mediums".
Do you paint in a layered technique?
Do you employ titanium white and cadmium colors?
Carlos, cobalt and manganese siccatives have been around for about 150 years. Referring to lead driers as "darkening" piques my curiosity. If you are referring to lead naphthenate, it's a relatively new siccative, and I'm unaware of any darkening that is inherent with its use. Cobalt driers have been blamed for darkening paintings since their inception, however.
It's a fool's errand to cast blame on materials which cannot be identified specifically for their content and quality, and even moreso to condemn materials generically without full knowledge of the techniques for use which were employed.
There is not one single thing we paint with (or on) which cannot be misused to the point of causing failure.
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