White Gold, Colour Measurement
 The laboratory originally researched and formulated various in-house test methods for Gold Colour and White Gold Colour Measurement and these have now been recognized as the accepted Industry Standard.
GOLD COLOUR MEASUREMENT
The colour of gold plating is influenced by the chemical composition and operating conditions of the gold plating bath. Use of a colour measuring spectrophotometer provides a scientific approach to controlling plating conditions.
Turnaround: Results usually reported within 2-3 days.
Sample Size: Flat test pieces are required (minimum sample dimensions are 8mm diameter or square measurable area).
COLOUR GRADING OF WHITE GOLD ALLOYS
A numerical grading system has been established for white gold alloys using the ASTM Yellowness Index D1925. The Index is calculated from the CIE (International Commission of Illumination) Tri-stimulus values, X, Y and Z which are measured using a spectrophotometer.
Turnaround: Results usually reported within 2-3 days.
Sample size: Flat test pieces are required (minimum sample dimensions are 8 mm diameter or square measurable area).
|
