Slippy Floors

Hi good morning
I am working out in Nigeria where a lot of the flooring is made of granite, we have just opened a new office and the floor area is really slippy and we are concerned that someone is going to have a serious accident if we don't do something about it. Can you recommend or supply any chemical or abrasive pads to roughen up the surface slightly to remove the high gloss finish so we can reduce the possibility of someone slipping.

Look forward to your response.
Thanks