WELLA colorcharm PAINTS™ Intermixable Semi-Permanent Hair Color. See It. Create It. colorcharm PAINTS™ are available in 22 shades of intermixable semi-permanent hair color. Gentle acidic PH color, lasts up to 20 washes depending on shade and initial color intensity, and fades beautifully on tone. Use multiple colors side by side without foils, mix shades together to design your own shade, and control shade intensity by adding PAINTS™ Clear pastelizer.