gordos pictures above look very dark because of the white background . i would not try to duplicate that color on your first attempt . like he said practice the timing
i like to aim the torch right above the side wall to shoulder corner because the end of the case is a little thinner and the heat goes that direction a little faster . if your heat colors do not look like they made it to the end of the neck then your torch is too close , keep aiming at the same spot just bring flame farther away and leave in the flame longer
I also find that the color may vary a bit depending on the cleaning batch. Even though I use the same materials when I stainless tumble my brass, there are times it will look darker or lighter than others. My assumption (!) is that it's due to variances in Dawn and Lemishine concentration.View attachment 107684
Edit: different brass will turn different colors depending on it's exact elemental makeup.
After much reading and a great deal of time devoted to experimenting I've finally just stopped using anything other than "Purple Power" and clear white vinegar added at the rate of a couple of ounces per gallon of water and then about a half hour or hour in the wet tumbler.I also find that the color may vary a bit depending on the cleaning batch. Even though I use the same materials when I stainless tumble my brass, there are times it will look darker or lighter than others. My assumption (!) is that it's due to variances in Dawn and Lemishine concentration.