Personally, I use Ceramcoat by Delta. These are artist's Acrylics in bottles witn an absolutely amazing array of colors. Somewhere in excess of 100 different colors
I always thin to the appropriate consistency for the paint job I am doing. This product comes in 2 Fl Oz bottles and larger, seals perfectly, lasts for years and blends perfectly together to make custom colors. I do not know the exact number of different cataloged colors but they have five or more metallic golds, many pearl colors plus a pearl base you can mix with other colors as pigment base.
In addition to everything else normal cost is approx $1.19 to $1.29 per 2 oz. btl and $0.89 on sale all USD. The bottles dispense pigment by the drop or any larger volume you care to squeeze out. The bottles are flexible plastic.
I have tried GW paints many times over the years and found all I have tried as seriously lacking in pigmentation and in maximum possible color intensity.
For inks I actually use several product lines of Calligraphy inks. For doing fine lines and details I use Koh-i-Noor Rapidograph Drafting pens as fine as 0.25mm. Some may regard it as cheating: I simply regard it as using artistic tool effectively. I can generate any color I wish too by appropriately thinning my favorite paint sufficiently to flow through these pens. I use an ultrasonic cleaner with simple green to clean pens and brushes of any paint build up.