Mexico's population is largely dark-skinned, but Mexican television ads routinely feature light-skinned actors, sparking accusations of racial discrimination.
The commercial has not yet been made, but the casting call specified it wanted "nobody dark skinned," only actors with "white skin."
The Catatonia ad agency said this week that a third company that sent out the casting call had used "inappropriate" language. "We regret this situation, which in no way reflects our thinking as a company or as individuals," Catatonia said on its Twitter account.
The casting call also said producers didn't want anyone with blonde hair or blue eyes.
For some social media users, the casting call confirmed what they say is a long history of implicit discrimination in Mexico.
Although most Mexicans have some Indian blood, and 6.7 million Mexicans over 5 years old speak an indigenous language, Indians have suffered persistent racial discrimination since the Spanish conquest in the early 1500s.
"I always get these racist ads, but they've never been so explicit," De Anda said.
The casting call also seemed worded to exclude anyone who doesn't look wealthy. It sought people "with a Polanco Look," referring to a wealthy, largely white Mexico City neighbourhood. It also said producers didn't want a "government look," an apparent reference to people who appear in ads promoting government social aid programmes.
Discrimination in hiring is illegal in Mexico, but the national anti-discrimination agency said it had no immediate comment on the case.
The poll had a margin of error of 1.4 percentage points.
