opaque or transparant colors



A few years ago i followd a basic workshop, we learnd to make the shadows with black and than fill in with transparant color.
Now see i here a lot of guys painting with opaque colors.
What is the difference?
What is the difference?

Lots :)..One obviously uses transparents and one is opaque, opaque covers whats there beforehand, transparents dont..I like to use the method you mentioned a lot about a black layer then tinting it with transparents, its fun :). The same can be done with a white base layer (If painting on a dark surface)..It can be a bit more difficult as mistakes can be hard to cover up..The rest is in that other thread LOL