Chrysanthos HF077 Royal Purple From  £5.95

Two to three coats gave a lovely deep blue finish. I use these glazes on embossed pendants and am delighted with the results which highlight the raised areas of the patterns. The colour looks better than your illustration.

The glaze is quite thin so you need to use several layers. It's a pretty colour but not any variation in recessed areas. It's much more purple (as in the title) rather than in the image.