In detecting nicotine and its metabolites in the body, levels remain detectable in the urine only for 3 to 4 days. However, this may be different for some cases. For passive smokers, urine nicotine test can be positive for as long as 15 to 20 days.
This slate blends well with any type of stone or frame structure and is also used as the basic percentage, usually 50%, in roofs where several colors are mixed. Semi-Weathering Gray - A traditional slate-gray color ranging from a clear appearance to having small black markings.
Crystal Glaze Sealer Water Based-Coating Type Recommended for any absorption slate Top Picture-Vermont Slate: Top portion is unsealed Bottom portion is one application No color enhancement High gloss Bottom Picture-Indian slate: One Application-Fully Sealed Medium Gloss Little or no color enhancement. The correct sealer will increase the strength and durability of slates.  2 Gauged slate is sawn to a uniform finish height so the end result is a smoother floor. 3  It is also less expensive to install by $1.00 to $2.00 per square foot.  4 Ungauged slate is unsawn and split to size.