These occur when lids are left off the tinter pots, resulting in the tinter drying out at the edges. Colour differences can occur between 500ml and 4 litres of a colour off the same base. This is due to the canning tolerance increasing percentage through the decreasing can size. Ensure customers are aware of the differences that can result from varying can sizes, and that boxing before use guarantees colour uniformity. Remember that gloss paints dry to a more intense cleaner colour than matt.
Acrylics show a greater colour change from wet to dry than do alkyds.
Colours may be lighter or darker than the colour card due to differences in gloss level and production tolerances in colour card manufacture. When tinting colour requiring more than one can or pail it is preferable to use the same batch number. Very rarely are colour complaints due to technical faults. For Tinting Stir tinters daily. Stick to recommended tinter levels.