as nearly as I can tell, this wood is generally sold in the U.S. under the name "chen", not chenchen, even though reference works show "chen" as belonging not to Antiaris spp. but to Tournefortia argentea. SO ... I'm confused.
my samples: NOTE: these pics were all taken in very bright incandescent lighting ("soft white" at 2700K) colors will vary under other lighting conditions
a fairly bland example of chenchen veneer
a much more lively sample
too much bright yellow in this pic but it was overexposed in the camera so I could not get the color corrected very well after the fact.
plank listed as ako
planks listed as bokonko / Antiaris toxicaria
plank listed as Antiaris africana --- I note that this is the same pic as the first of the Antiaris toxicaria shown directly above so obviously one of them, and possibly both, are misidentified. Since THIS is by far the larger image (see enlargement) it is probably the original image and might be properly listed, with the other one being lifted from the site that had this one and then misidentified.
planks with the kind of nonsensical color representation that are the kind of thing that made me start this site in the first place.
veneer --- these are from a vendor whose pics make many woods look green, regardless of the actual color of the wood.