Set of 6 lignum vitae cups

Made over a period of years - the darkest one having been most exposed to UV light.
The splash of black heartwood in the centre of the blanks was what first stimulated me to glue square sticks of wood together to create this effect (because blanks like this are so scarce) , and this later led to the composite goblets pictured in this site.
The next picture shows my first attempt to recreate the black heartwood artificially