Rohm and Haas Co., Philadelphia, announced a revamping of the network of sales agents representing the company's UCD colorants for coatings and specialty applications. The action is one of several moves being taken in relation to customer support and service, the company said. The sales-agent firms include Whittaker, Clark & Daniels, South Plainfield, NJ, which will handle sales in the northeastern and western United States; McCullough and Associates, Atlanta, which is responsible for sales in the Southeast; and Wise Technical Marketing, with offices in Chicago and Louisville, KY, which will handle sales in 12 Midwestern states. Representation in Canada is handled by Canada Colors and Chemicals Ltd.