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Hi Everyone,
One of my favorite discussions ... VALUES! Here is another opinion. The blue glass referred to is as bad as the red gels that are out there for helping one see values. The glass acts as a filter, it does not add light or color, it can only subtract. The problem is that it does not subtract equally. It acts with greater effect on the reds, yellows, greens etc. differently from blue and to each other. It makes blue objects appear lighter in relation and yellow object appear darker. Therefore as an aid to seeing values, it is doing just the opposite by altering the relative difference between the values and thereby altering the edges of the meeting places of the value shapes.
The black mirror is only slightly better in that it does not alter the relative values of the colors but it does change the relationships within the darker values and softens the edges between the shapes, therefore limiting it's use in the darker range.
My advice to my students is to always beware of anyone trying to sell you something that supposedly helps you to see values. Squinting is free and has none of the pitfalls of the 'glass' methods. It is instantly adjustable, always with you and is free. Squinting will never let you down once you have mastered it. It is also invaluable in judging edges and there relations to values.
Good luck to all and I hope to see great thing from everyone.
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