Colombian police seized a shipment of black cocaine that is almost impossible to detect with traditional anti-trafficking methods, regional police chief Fabio Cardona said on Sunday.
"It's the first time we have encountered this type of cocaine," Cardona said after reporting that 15 packets of the drug had been discovered in the fuel tank of a car heading to the El Dorado airport in Bogota.
"It's one of the many strategies of the traffickers" to evade authorities, said Cardona.
Black cocaine has no odour, making it extremely difficult to detect, even for well-trained drug-sniffing dogs.
The 15 drug packets, of undetermined weight, were only found to be cocaine two days after their seizure, after police sent the stash to police laboratories to investigate their chemical compound.
Black cocaine can often be smuggled undetected - disguised as plastic coating, print cartridge toner, make-up or fertilizer - and effectively washed out with a solvent upon delivery.