Alvin Watercolor Naple Yellow Deep is the best quality in the world. They use ASTM pigments when they make the product. The color is bright and it is sold in individual tubes or sets of three. The formula has improved when you want to reuse or re-wet the paint. It has professional tinting strength, color vibrancy, and is a good value. It comes in transparent, semitransparent, opaque, and semi-opaque. It is made in the US.