The BS EN 13523-14-2001 standard focuses on the determination of chalking (Helmen method) in the test method for coating metals on coils. The standard specifies a procedure for objectively determining that organic coatings on metal substrates produce chalking due to natural or artificial efflorescences. The advantage is that the measurement results can be read directly on the instrument without subjective visual comparison. However, this method is not suitable for embossed coatings, and the texture coating and dust accumulation of outdoor efflorescences samples can affect the reading.