Some food for thought regarding black cloth, and equally important -- black chalk from info I posted a while back within a chalk thread started by another AZBer:
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Two points about atypical chalk colors. And they apply to both Masters and Silvercup. The points were illuminated for me long ago when a clubhouse where I played had *black* fabric on the tables (friggin' corporate designers for the community development wanted the tables to coordinate with other furniture in the clubhouse). Anyway, both Masters black and Silvercup black were equally problematic & miserable to use.
I soon called Masters (Tweeten) and a very helpful and sympathetic sales rep (as in "Good luck with certain unconventionally-colored chalks") explained things for me:
-- Chalks in little demand, sit around way too long in warehouses and supplier inventories and their properties (questionable to gin with), deteriorate well beyond the rapidly-turned-over conventional colors..
-- Why the questionable playing properties of certain colors? It's due to the interaction of certain color dyes with the basic chalk ingredients (mainly silica and proprietary binders), which must be, and are, used in chalks of any color.
Bottom line forget your generalizing (actually needlessly denigrating) comments about Masters. Masters and Silvercup are leading brands for good reason -- their chalks are excellent (moreso for Masters) and both brands' would readily admit that certain colors of their product have less-than-ideal properties for the aforementioned reasons.
Hope this clarifies the matter for players who haven't heard about these elements of the issue.
Arnaldo