Hard to get Turquoise colour and this is pretty close but leaning more towards aqua.
Ended up using Cyan Ink Jet ink diluted down, 4 parts water to 1 part ink from memory and with using Tru Oil as the top coat added a slight greenish tinge from the natural light amber tones inherent in TO. Clear poly or acrylic may have kept more of the aqua look but had plenty of TO at the time that needed to be used.