What is the recommended notation for bowed marimba?

It's fine and standard just to write arco or some equivalent in another language (just writing "bowed" is also fine). See this page for more stuff on marimba techniques.

1. How do you notate bowed Crotales?
2. Can you bow a marimba?
3. What is a bowed vibraphone?
4. What is another technique used to play the vibraphone?

How do you notate bowed Crotales?

Crotales are also dangerous territory, as their might be desire to both vibes and crotales. A bowed note can be “stopped”, or suddenly muted, simply but abruptly stopping the bow without stopping contact with the bar. By leaving the stationary bow touching the bar, the note will be unable to resonate.

Can you bow a marimba?

Like other keyboard instruments, the marimba can be bowed. Despite its superior size, it is limited in its sound production. Bowed marimba is particularly quiet and is unable to cut through most textures, so it's important to be mindful of employing this technique in a dense piece.

What is a bowed vibraphone?

It's a percussion instrument, so it's supposed to be hit with a mallet. But applying a cello bow to the metal bars unleashes a sound like no other. The sound of bowing instantly makes it appear orchestral at first, but then you soon hear a slowly evolving glassy, almost metallic tone appear from underneath.

What is another technique used to play the vibraphone?

The sustain pedal, mallet dampening, hand dampening, motor use, note bending, mouth vibrato and arco playing all are unique to the vibraphone. Due to these techniques and resulting sounds, care must be taken in selecting appropriate material.