which stone is best for flooring?

Here are some of the best options for natural-stone floors in the kitchen.

1. Granite. Granite is a great option for homeowners who have previously chosen granite slabs for their kitchen counters. .
2. Mrble .

3. imestone. This material is ideal for kitchens with a rustic or traditional style. 

4. Slate. .
5. Travertine. 

which marble floor color is best?

In this case, perhaps a darker shade, such as black or grey is a good go-to. For bathroom floors, white or cream marble is goodl.
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If you're going for a bathroom, then the general consensus is that you choose from the following colours:

black

blue

white

The Ocean black marble of Iran is one of the most precious marbles . Few materials, in fact, can compete with its transparent sheen and its incredibly compact structure.

how can clean old marble?

Make sure there's an inch or 2 of water above the marbles. Add a denture tablet. Allow marbles to soak in the fizzy water for about 20 minutes. Drain the marbles through the kitchen strainer, and rinse with warm water.

Marble is a soft stone made of calcium carbonate. . Baking soda is alkaline, so you should only use it with caution. It is also a mild abrasive, so you need to use it gently rather than applying  to your cleaning tasks.

Mix baking soda with water using a ratio of 3 tablespoons to 1 quart of water. Spray this mixture on the marble surface and gently wipe it with a dry rag.