New Delhi, 28 May (NNS): The prices of black pepper markara held firm at Rs 685 per kg due to the sluggish sale at the higher level. Recently, the prices have gone down by Rs 15 per kg. Presently, both the arrivals and the prices held stable at the same level of the previous day in Kochi. The market sentiments may affect because of the higher prices in the stock of Vietnam. The spot black pepper prices will likely to remain decrease during the coming days.