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Hi @MinkeyDGreat and Welcome!
I have never heard of this rosin.
I did just a little preliminary research on the web. There is a review written on certain forum () here. It is an ok review.
The reviewer did post a link in the comments showing where to obtain the rosin. It is a private seller on Etsy. They have some kind of a company but looking it up, I did not find any results as to where they are located or what the company does, other than this rosin in Chicago, IL.
They have only one variety they sell, which appears to be a light rosin. It is a natural pine rosin, which is interesting because most rosins are derived from a natural product. I do not know if pine rosin is really any better than rosin made from other types of trees. However, I do know that not all rosins are created equal. Dark rosins and light rosins are for specific environments and specific strings.
The seller describes the rosin as "formulated by a violin player specifically for violin players; but it turns out that it works equally well for all string instruments, especially classical viola and cello." Which I find odd because most rosins are instrument specific. Some are better suited for violin and others for cello, etc. Actually, this is referring to the different strings on the instruments. Cello strings are quite different than violin strings, and they often use rosins designed for those strings.
I could not find any other reviews written by players who have used the rosin.
One thing to keep in mind, rosin is something players should experiment with. Especially if you have changed to a different type of strings or if the instrument was recently purchased. What works for one instrument or environment may not work as well for another and it may require trying different rosins on an instrument to find what works best.
Good luck with this rosin. I hope it works well.
- Pete -
I notice that the two highly positive reviews in the thread are both from people on the California coast -- dry and not too hot, which favors dark rosins. This suggests the Deja is probably grippier than the typical light rosin, though Andrew Victor observes that it still feels "toward the harder end of the usual range" like a light rosin.
From the descriptions, it sounds like a finer-grain rosin (like Jade) but somewhat lighter/harder than Jade.
Based on Andrew Victor's comments on Maestronet and Violinist I decided to give it a try and ordered a cake. I'm not really too particular about my rosins (most of my playing is done in an air conditioned house and moderate humidity) but it sounded interesting.
Bob in Lone Oak, Texas