Our practical experience
Hi Chemiboy -
Originally Posted by chemiboy
In house we have both, and from a practical standpoint they have felt comparable for accuracy. The one caveat is that you should only compare data taken within one system or the other for best correlation.
We have never had luck accurately measuring wet samples on a spherical spectro as it required a film over the wet product to prevent mechanical damage. Our 45/0 works has worked very well for wet and dry samples, and we use the X-Rite system you reference extensively for that reason. This is especially true where color development and quality checks requires measuring wet films, such as when producing oil paints as the time needed for films to fully dry make taking measurements at various steps in the manufacturing process of a particular batch impractical. The instrument has a very sophisticated ability to adjust for the influence of ambient light and its readings have been quite accurate.
On a final note, no matter what the spectro says, at the end of the day the human eye is always the last arbitrator. We use spectros as a way to record data and to get close to perfect color matches - sometimes extremely close.....but it still needs to pass inspection by some very practiced human eyes. So in that sense we do agree with AMIEN and would encourage you to not rely solely on instruments for color matching or development.
Hope that helps.
Technical Services Supervisor
Golden Artist Colors
Williamsburg Handmade Oil Colors