You shouldn't need TD with BRV. At least in the three kinds I soaped, TD wasn't needed. Here's how I mess with TD. If you have water soluable, put it in a cup and had a little water (very little actually). If it's oil soluable, then pull a little bit of oil from your melted oils and dissolve it in that. I use roughly between 1/4 to 1/2 tsp (probably closer to 1/2). When the soap is made, I pull off about 1/4 cup and mix it. After I have pulled other colors, I will add the TD to what's left and mix it. Two nights ago I had a yellow batch going (w/o) adding yellow. I used the TD and I have a creamy white or slightly off white color, which is a relief. The yellow wasn't going to go with my other colors. One thing to remember about TD, it will affect all colors in your batch unless you separate it. Sometimes it can totally alter the initial color and sometimes it makes a color better.