Attorneys for Starbucks Corp. and other coffee sellers have less than two weeks to persuade a Los Angeles County judge to reconsider a proposed ruling that could force them to post cancer warnings in stores and on packages.

Superior Court Judge Elihu Berle, in a tentative decision issued Wednesday after a trial, said Starbucks and dozens of other defendants had failed to prove that the level of acrylamide in their coffee poses no significant health risk.