Dr. Ph. Martins Bleedproof White is the most renonwned White Ink for Calligraphy. It is a dense, opaque, very covering, non-waterproof, white colour. It works excellently on all paper-based surfaces. It is great for doing layers in watercolour painting and also for calligraphy purposes.
Dr. Ph. Martins Bleedproof White is available in a 1.0 oz (30 ml) glass jar. It comes in a thick paste like form &  can be diluted with water. It gives a shiny finish after drying. This smudge proof colour can be erased over after drying.
 
How to Use:
Before applying, stir the liquid with a stirrer as it might settle down. While using with a dip pen, if the colour seems to be too thick for use, add 3-5 drops of water. And stir the surface of the liquid until a heavy milk-like consistency is reached. If it still refuses to leave the nib, dilute it with a bit more water. On the contrary, if it gets too diluted, let it settle down for some time with the lid open to allow some water to evaporate out, then try again. Clean the tools with water before and after use.