Ka lebaka la keketseho ea theko ea aniline ea lihlahisoa tse tala, litheko tsa Solvent Black 5 le Solvent Black 7 li eketsehile haholo, 'me phepelo ea tsona e bile thata.
Ho feta moo, theko ea thepa e tala H acid e ile ea phahama.Ka lebaka leo, theko ea Disperse Black EXSF le Disperse Black ECO e ile ea phahama hanyenyane ho tloha halofo ea khoeli e fetileng.