Darron Spohn , Nov 30, 1999; 01:33 a.m.
I don't understand how the sky could be white. Using a red filter to turn the sky black means there should be no density in that part of the negative. I'm looking at a T-Max 100 negative I shot in Yosemite last year using a red No. 25 filter. The sky portion of the negative is clear. I developed the film myself and printed it on Zone VI #2 fiber paper. The print matches the example shown here.
This is just a small portion of the negative uploaded to illustrate what a red filter should do. Who developed the film and printed it for you? Did they print it in a black and white darkroom or on a one-hour machine using color paper?
Clouds above Yosemite Valley