Some inks come in one thickness and the sofer can add water or a Medallel to thin it if necessary.
Some inks come in a choice of thick, medium, and thin. Even then, sometimes a few drops of water may sometimes be necessary for a perfect fit to the convenience of the sofer.
Which kind of inks is preferred by most sofrim? Does it help if all thinning is done by water, never needing a Medallel?