There are three types, white, metallic and transparent. They all mix with water but when dry are resistant to water.
White is used for tracing. You have to shake the pot before using it.
Metallic , silver and gold, can also be shaken but the bits quickly fall to the bottom so it is best to give it a stir with a small cocktail stick or similar. Two coats are advised.
Transparent inks are available in about 10 colours and you can mix them to create the shade you want.
Pinta Perla is a water based acrylic paint which gives a pearly sheen.
Perga Color are water based felt tip pens, you can mix colours together on a palette
Perga Liners are pencil crayons, they come in oil based and water colour or aquarelle.
Dorso crayons are oil pastels and can be used to colour the back of parchment. They can be applied with zest it or turpentine.