Lots of people discuss the color of Trenbolone. Here is a test with pictures to demonstrate trenbolone thermal properties.
Sample: 0.5ml trenbolone acetate @ 50mg/0.5ml
Pure trenbolone acetate
Note the colour of pure trenbolone is a light canary/golden colour.
0.5ml GSO, benzyl benzoate (30%), benzyl alcohol (1%)
This is what a typical carrier oil will look like before the raw material is added. Note that is is very light as most carrier oils are typically light in colour and are lightened even further upon addition of various co-solvents and preservatives such as benzyl benzoate and benzyl alcohol.
Carrier with 50mg dissolved trenbolone acetate
Note that the colour of this solution is now a light canary/golden colour when the raw material is dissolved. This is the colour you would ideally like to achieve when making it or purchasing it yourself. This solution was made at room temperature and would later be sterile filtered to ensure sterility, rather than being sterile filtered and then heat sterilized.
Solution heated at 100 degrees centigrade for 20 minutes
As this solution is heated at 100 degrees centigrade you can see that it begins to visibly decompose and discolour the solution.
Solution heated at 120 degrees centigrade for 20 minutes
Again, as the heat increases the trenbolone continues to decompose and discolour the solution. Note that 121 degrees centigrade would be the minimum temperature required to reliably sterilize this solution.
Solution heated at 140 degrees centigrade for 20 minutes
At this point the trenbolone has decomposed significantly.
Granted, the colour of the solution may vary depending on the carrier oils used. For example, sesame oil can vary from light to dark depending on the seeds used in manufacturing. As well, more exotic carriers such as ethyl oleate may darken or deepen the yellow coloration of the solution.
That being said, the color of trenbolone do not effect the purity.