All of our standards are prepared from real ores or blends of real ore with ore concentrates
** Please Note:
CDN-W4: Au value is “provisional” only (RSD = 6.4%)
Standards with an RSD of near or less than 5 % are certified, RSD’s of between 5 % and 15 % are Provisional, and RSD’s over 15 % are Indicated. Provisional and Indicated values cannot be used to monitor accuracy with a high degree of certainty.