I see a lot of Thassos.
Lesser quality Thassos can sometimes exhibit some darker markings.
If the face of the stone is clean there is a good chance what your seeing is in the stone.
Test the suspected area with a high alkaline cleaner or even Little bleach.
You will find it probably isn't soiled.

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> On Apr 2, 2015, at 6:55 PM, Chris <csantospago@gmail.com> wrote:
>
> Mike. The builders had their tile installers do the initial work. Install is almost perfect. Tile was bought honed. They are looking to just hopefully make the fissures less noticeable. It would be a shame to tear it out.
>
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>
>> On Apr 2, 2015, at 6:46 PM, Mike M <nulifesc@bigpond.com> wrote:
>>
>> How did you get the referral?  It confuses me sometimes when I come across a beautifully honed/flattened floor that they want a bid for work, I always think, “what about the poor guy who did such a great job on this, shouldn’t you call him?”  Where is the reward for doing a great job?
>> Where I am from this dosent happen often, (usually the other way) but it is something that bugs me.
>>
>> As far as the job I would use a mild alkaline with an pressure-extractor, then a 1500 monkey pad.
>>
>>
>>> On 3 Apr 2015, at 8:35 am, Chris <csantospago@gmail.com> wrote:
>>>
>>> Thassos white honed tile bath floor. 1 1/2 year old home. Very high end picky homeowners. Met the builders there today. I told them the fissures are characteristic of stone. Eventually dirt gets in there and they become more noticeable.
>>> Any ideas on what will clean them?
>>>
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