8mm Forum: Marks on a film

This is topic Marks on a film in forum 8mm Forum at 8mm Forum.

To visit this topic, use this URL:
https://8mmforum.film-tech.com/cgi-bin/ubb/ultimatebb.cgi?ubb=get_topic;f=1;t=011689

Posted by Antoine Orsero (Member # 41) on August 25, 2017, 09:07 AM:

Hi,

I have these marks on one of my Super8 films. Do you know what it is
?

Thank you very much

Posted by Michael Lattavo (Member # 4280) on August 25, 2017, 12:21 PM:

Looks like redox blemish, see link below:

https://filmcare.org/vd_redoxblemishes.php

Posted by Antoine Orsero (Member # 41) on August 25, 2017, 12:53 PM:

Thank you very much Michael,
This movie has never been exposed to the humidity at home I have many other movies that do not have these stains! I think I bought it like this with this defect and it is the former owners who have trouble exposure!
Best regard

Posted by Chip Gelmini (Member # 44) on August 25, 2017, 01:18 PM:

I once saw this effect on a 35mm print in theaters. It turned out the projection lamp was too strong and every frame was slightly burned as shown in the example above. In my situation a tech came in and adjusted lamp output and the print was replaced.

Since I believe most super 8 prints start with a 35 or 16 (mm) positive print - to a 16 (mm) inter-negative - to a super 8 positive print it is possible the original master material could have had this trouble. Therefore, every copy made would show the same.

However an entire batch with this problem would be noted, so it is doubtful it is in the mastering. If I am right, your copy somewhere sometime could have been burned. As the heat was too strong and every frame got burned as it went through the projector. And it was the actual motion that prevented the frames from being completely burned as would happen in "still" mode or projector malfunction.

I have many many old prints which I have stored in my cool dry basement average temperature throughout the year 60 to 70 Fahrenheit. I have never seen this issue before at home.

Just a wild guess.

Posted by Bill Brandenstein (Member # 892) on August 25, 2017, 03:43 PM:

Heat damage would tend to cover the entire center of the frame and be dark brown, not orange. So I agree that this is the orange spot syndrome termed "Redox." However, the website Michael linked to fails completely to mention that this is the fault of bad lab work and sloppy final washing. Please see Kevin F's helpful comments in this old discussion thread.

Posted by Antoine Orsero (Member # 41) on August 26, 2017, 08:14 AM:

Thank you Bill.
Best regards

UBB.classic^TM 6.3.1.2