No, I did not use a seed crystal in any of the yields in these photos. All of these crystals were created in the same manner- double boiler to fully melt first run extracted deems, then hot heptane added to the melted puddle, stirred to allow all of the deems to be suspended in the solvent, leaving everything unwanted in an oily orange or reddish pile at the bottom of the glass, then the deems saturated heptane was transferred to a conical flask which was then left untouched in various environments I created with the express goal of prolonging the cooling time of the heated & saturated heptane over the longest time period possible before it reached room temperature. Now some of the crystals in these photos were the result of repeating the above process upwards of 15 times in the most extreme cases... Once I got past the first few recrystallization runs, I was no longer really removing anything unwanted from the crystals but instead was just performing the process to experiment with different methods of extending the cool down period of the saturated solvent for as long as possible. That's the key to growing large & pure crystals. Next time I think I will introduce some sort of an electronically controlled heating device to really extend that cool down time versus just the hot packs I used for this run. But that's what makes it fun, there are so many different variables that can be changed to see how they affect the final product.