Lol, not just mulatoo...quadroons, octorroons. Many Brasilians from long brasilian lineage (not second or third generation brasilian...but among the oldest lineage, basicly the one with portuguese ancestry) look white while having 1/4 or 1/8 african brasilian in them. Many have the african phenotype in them.
Adriana Lima is a quadroon...1/4 afro brasilian, her father (i think ) is mulatto...If she was born in the US, she would be defined as an african american because of that one drop rule. She is basicly like Mariah Carey, 1/4 Black..
I have myself quadroons and octorron (1/8) cousins and nieces...some are white and blonds, others, from the same father/mother looks mulettoes, others have that exotic look a la Angelina Jolie...only Black folks could pinpoint that they have african ancestry in their blood because many african have in their families mulattoes, octoroons, ect....
Point is many Brasilians are mixed even when they don't look like it..