Ciba Specialty Chemicals has announced it will acquire EFKA Additives, a supplier of additives to the paint and printing ink industries based in Heerenveen, The Netherlands. Terms of the transaction, which is subject to regulatory approval, were not disclosed.      Ciba said the acquisition will strengthen its position in the coatings industry. “The acquisition of EFKA Additives is part of Ciba’s ongoing objective to focus on profitable growth and innovation,” said Armin Meyer, Ciba’s chairman...