One thing that you notice about trenbolone is that it is often a golden-brown / rust colour when in oil solution. If the hormone powder is refined to greater than % purity or so, then the colour of trenbolone in solution actually gives a very light golden colour, much like other testosterone products; however, refining the hormone to this level of purity is extremely difficult. This is why there is colour variation from batch to batch with different underground labs; something as small as % purity can affect the colour of the final product.
In summary, whichever form of tren you use, be cautious of the product and individual. Some legit brands are: Quality Vet, Denkall, and the most recent thus far Animal Power veterinary brands. They all currently make very good and pure versions of trenbolone (you will have to look but you can find various esters available also). Novice dosage is around 2-3cc's a week for a total of 150-225mg/week. Upper level advanced and very seasoned users may use upwards of 4-5cc's a week. If you were my family member, I would tell you to not use more than 3cc/week and not to stay on any form of tren for longer than 12 weeks (three month cycle).