Dr PH Martin’s Bleedproof White is my absolute favourite white ink for calligraphy. It gives crisp hairlines and is opaque, so really stands out beautifully on coloured paper. You need to mix it with a little bit of water to get the right consistency. The wide neck bottle makes for easier access too.
Your calligraphy tool kit shouldn’t be without some Dr PH Martin’s Bleedproof white! I am sure you will love this as much as I do.