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what is the means of "X" in kodak Tri-X 400 film?

kodak Tri-X

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#1 YongLee

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Posted 29 January 2017 - 07:33 PM

I want to know the means of the letter "X" in the kodak Tri-X film.  thanks!


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#2 David Mullen ASC

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Posted 30 January 2017 - 12:10 AM

"X" was used for Kodak product names before Tri-X came out, such as Panatomic-X and Plus-X.  One explanation might be in this Wiki entry (just a guess on my part):

 

https://en.wikipedia...wiki/Film_stock

In 1920, a variant of Type F film known as X-back was introduced to counteract the effects of static electricity on the film, which can cause sparking and create odd exposure patterns on the film. A resin backing was used on the film, which rendered the film too opaque to allow focusing through the back of the film, a common technique for many cameras of that era. The X-back stock was popular on the east coast of the US. 


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#3 Simon Wyss

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Posted 30 January 2017 - 11:15 AM

It’s got to do with gold sensitisation, one of a number of emulsion ripening secrets. Gold plays a role with raw film manufacture until today.


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#4 YongLee

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Posted 30 January 2017 - 09:30 PM

thanks , thanks to David Mullen ,thanks to Simon Wyss.  :D


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#5 Andries Molenaar

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Posted 02 February 2017 - 04:11 AM

I want to know the means of the letter "X" in the kodak Tri-X film.  thanks!

 

It is just from ancient marketing. Kodak came to using X as a strong sounding term for an enhanced basic BW film. Later they came up with:

XX

Double-X

Plus-X

Tri-X

4X

Where it mostly relates to ASA rating being multiple X


Edited by Andries Molenaar, 02 February 2017 - 04:13 AM.

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