What type of pen should be used to sign the ketubah?
You can use any pen with indelible ink. We strongly discourage the use of fancy fountain or ink pens since these tend to leak, especially when people are not used to writing with them. We have seen horrible ink accidents. Choose a trusty medium ball point pen (any color, although many couples prefer black) to give the ketubah the look of a signed document, which is what it is.