Preserving the colour It is advisable to store the ink in a dry, well-ventilated, dark place with a temperature of between 10° and 25°C (avoiding the direct rays of the sun). It is important to store the ink well away from sources of heat and also from acid or alcaline products. Mixed storage is not advisable. Make sure that the containers are tightly closed. The containers should be in the normal position (standing up). Once a container of ink has been opened, it is advisable to close it again, to prevent it drying out, or a crust forming on top. To avoid, or remedy these problems, carry out the following procedure: cover the ink with a layer of thinners of the same series as the ink.