Vincible ignorance: not complete and can get out of it. Before acting must leave doubts. If you do not want to know, will not excuse ignorance of the blame, however, can aggravate the fault, as ignorance or directly vaguely spoiled darling. Although ignorance relieve guilt, remains the duty to seek the truth, to work conscientiously.
Invincible ignorance: is complete and therefore not known to be ignored and for this reason is unsurpassed. Precedes action and enough knowledge to prevent, destroy or voluntary responsibility...
It is common sentence without warning, with disabilities or defects in the voluntary act is morally blameless. Invincible ignorance makes the act blameless, no sin from the moral point of view...
Ignorance deprives the act (in itself or ignored or unnoticed aspect of the act) have formal morality by object or by the same unknown circumstances itself or in relation to this subject, if known as those modalities, when the act was executed precisely because of that ignorance. Nothing, indeed, deliberately accepted by the will, he first proposed it understanding.