Bank regulators are sharpening their tools for identifying and curbing discriminatory practices in the home appraisal industry. The Federal Reserve Board, the Federal Deposit Insurance Corp., the Office of the Comptroller of the Currency, the Consumer Financial Protection Bureau and the National Credit Union Administration plan to devise new ways to monitor appraisal processes for racial, ethnic and sex-based biases, according to a report published this week by a White House task force aimed at addressing long-running prejudices in appraisals. The agencies will also scrutinize mortgage lenders to identify patterns of bias, work with other government agencies to enforce new rules and create a shared database of historical appraisals to benefit research and enforcement efforts. They will also take steps to improve the reevaluation process for buyers who feel their properties have been unfairly discounted and design guidance for computer-generated valuations.