What are you using for glue? Are you using a polyester resin or an epoxy? If it is the polyester resin you have to get the 6 piece coloring kit:
http://www.defusco.com/6pc-tenax-poly-color-kit-p-1439.htmlIf it is the Instant Install then you also have to use the kit above as it is a mercaptan epoxy and the epoxy base in the colors is not meant for use with that type of epoxy. It sill still work but it will significantly slow down the drying process of the high speed mercaptans.
If it is a regular epoxy you have your own choice. Since a seam is non-structural you can do it with either the color kit listed above the the epoxy based colors.
If it's up to me I am getting the full kit for $39.90 instead of 1 color for $19.95. Wit Uba Tuba you can mix the green with just a touch of black to match the base color of the stone better.
Glad to be of service,
Mark
