Dust and other marks when scanning

[Alan Edward Klein]

I just scanned a 4x5 Tmax 100 BW negative and there were these marks on the scan. I did not use ICE on the V850. This is 1:1 shows a portion of the sky with cloud. This was processed in lab. Thanks Alan.

1. white streak and spots blue circles?
2. Black spots orange circle?
3. White blemish green circle?

 

[shutterfinger]

Dust, dust, and more dust. I use a Staticmaster brush and heavy weight microfiber lens cleaning cloth to gently clean the negatives, film holders, bed and transparency glass and still occasionally get them.
That new scanner's plastic film holders and sometimes the bed glass are static charged and attract micro fine particles in the air. Wear cotton clothing when scanning as synthetic cloths and blends create static.
Sometimes its a total pain to to get rid of the spots so its just cut them down to a minimum.
Check suspect areas of the negative with a good loupe.

 

[Adrian Bacon]

Dust, dust, and more dust. I use a Staticmaster brush and heavy weight microfiber lens cleaning cloth to gently clean the negatives, film holders, bed and transparency glass and still occasionally get them.
That new scanner's plastic film holders and sometimes the bed glass are static charged and attract micro fine particles in the air. Wear cotton clothing when scanning as synthetic cloths and blends create static.
Sometimes its a total pain to to get rid of the spots so its just cut them down to a minimum.
Check suspect areas of the negative with a good loupe.

+1. You can spot it out in LR. Just use the spot healer tool in the Develop Module. It's right below the histogram.

 

[Alan Edward Klein]

Why are some white and some are black?

 

[John Bragg]

Why are some white and some are black?

The white ones are dust on the negative. Black ones are clear on negative so either dust in camera or something adhering to film during development or even tiny air bubbles. Do you do the obligatory bump on the tank when you fill it to dislodge bubbles ?
Ps ICE does not work on conventional BW film. Only colour or Chromogenic film like XP2.

 

[shutterfinger]

As you close the lid on the scanner turbulence is created and particles from the surrounding area are pulled in so close the lid gently.
Inspect the negative with a good loupe in the suspect areas. High density blocks light which translates to white in the positive image; little or no density passes all or near all the light which translates into blacks in the positive image.

 

[George Collier]

Also, remember the scale at which you are viewing this image, per your posted shot. Imagine that it is a 16x20 print and you are viewing this very small area with a loupe. Would you expect perfection from 4x5, which is exposed to air throughout the loading, unloading, processing, storing and retrieval over its life?