Dyeing with Logwood

Last weekend I ventured into a dyeing project. Here's a photo of my adventure. The first dye was with Logwood which I soaked and heated for a half hour and then poured the liquid off.  The darkest purple yarn was achieved with a tin mordant and the first pass through the Logwood dye bath.   Next I took some locks and poured some of the dye bath over them and added a little heat for a short while.  Then I added the roving to the rest of Logwood dye bath.  I didn't mordant the roving, but I assume a little tin residue was probably in the dye bath by that time.  (Or does the mordant always stay on the wool that was previously in the dye bath?) The roving was heating and then it sat over night before I rinsed it out.  The fourth dyeing project was with cochineal.  I used only a heaping tablespoon of the dried bugs, ground them in a coffee grinder (the one that's for dying only), and didn't use a mordant.  The skein was submerged, heated, and left overnight. The result was a nice rosy-pink color.  As you can tell my my description of my dyeing project, I am not a precise dyer.  I don't keep records, I don't measure much, and I don't expect to impress other natural dyers by my techniques.  However, I do enjoy throwing wool in a pot and seeing what happens. If I don't like it, there's always over-dyeing.  ;)