You may have seen hand-printed marbled paper on the inside covers of books, or inside old luggage or cabinets. This pattern was achieved by floating inks and other chemicals on a liquid surface and then pressing paper against it. Variations in the basic process lead to different types of patterns, like this Spanish moiré on Turkish with gold vein pattern.
The pattern is created by making a Turkish pattern where the first colour used is gold. As further colours are dropped to complete the Turkish pattern, the gold constricts into veins. Then a paper, which has been folded in half is laid onto the bath, moving slightly from side to side to create the curvilinear gradations typical of this pattern.
Learn how other vintage patterns were made at BibliOdyssey. Link