I recently bought a couple of tubes of artists watercolours by Sennelier and what a difference.
In this sketch, I only used the yellow here along with the old set of watercolours I`ve had for years and you can see how bright the yellow is and I hardly used any paint at all.
Still the old ones are good too and have lasted me well, just a big difference in strength.
AnneMarie Foley, Artist living in Fairyland U. K 