Having taken advice from a number of sources including the office of the Lord Lyon King of Arms , the committee recommended that the optimum shade of blue for the Saltire should be Pantone 300 ( that is , 0 , 114 , 198 in the RGB color model , or # 0072C6 as hexadecimal web colors ) . Having taken advice from a number of sources , including the office of the Lord Lyon King of Arms , the committee recommended that the optimum shade of blue for the Saltire be Pantone 300 .