A 260 nm to 280 nm ratio of 1.8 is considered..

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The 260 nm to 280 nm ratio of 1.8 is a commonly used ratio to determine the purity of nucleic acid samples. A ratio of 1.8 indicates that the sample is pure DNA. This is because DNA has a strong absorbance at 260 nm, while protein, RNA, and other contaminants have a strong absorbance at 280 nm. A ratio of 1.8 indicates that there is minimal contamination from protein or RNA, and therefore, the sample is considered to be pure DNA.

A 260 Nm to 280 Nm Ratio of 1