I'm fairly convinced I am doing this wrong and my problem is at a fundamental level. Please help if you can tell what I am doing wrong. In short, I cannot get the corner burning to look the way I want. Posted here is an upper 4x6" square of my 8x10 print. Paper is Ilford MGIV FB and film used was Delta 3200. (which isn't important for this discussion but explains why it's so grainy) Base exposure was done at grade 2.5 filter and for 12 seconds. Burning of the corner was done with grade 00 filter and for 24 seconds with me moving a card back and forth in the range indicated for the entire time. For your reference black rectangle on the back is actually black and the white card behind is white. (for density reference) Neck part is obviously over exposed. There are two problems. Please note how far I moved the burn-in card and compare it with how abruptly and in short distance the density changes. This isn't what I wanted. I wanted the change to be gradual across the span indicated. Please also note, the upper corner didn't reach max black. I wanted it to.... but if I lengthened exposure time to 36 seconds, it still didn't reach black. It just got a little darker and the abrupt transition mentioned above became more obvious. If I used the same filter as the base exposure for the burn-in, it was more closer to what I wanted in terms of density change and the maximum black, but it made the vertical line you see in the left edge more obvious. I didn't want that either. So I ask... what am I doing wrong? What I'm really after is for the corner to be nearly completely black, and gradation to start at the upper line and smoothly transition to the base exposure at the bottom line.