Air Conditioning Condensation on Floor Marble

Our company is in a business of marble and granite here in Brunei. Since this is a tropical country air condition is considered a must. We are experiencing some sort of water condensation marks on the floor marble every time the aircon is turned off. Other dark color marble has no problem it is not very visible but the likes of Avorio and cream marfil it is very obvious especially when light is turn On and it is reflecting on the marble. Is there any chemical available to solve this problem, we already tried to seal the marble before installation with stone sealer and some times with oil and water repellant. The concrete slab was also applied with water proof but still to no avail. Thanks.