SILLY QUESTION (s)
Is the pinkish cast visible to the naked eye or does it only show up in your images?
Since it is white, Are you lighting your background with a background light- strobe- continuous?
In it's original condition, is the cloth bleached or painted with a sizing? Some of theses things will discolor with age.
Has there been any changes in lighting gear, camera type or anything else in your methods?
If you are using an electronic flash as a background light- and old tube can cause color shifts due to carbonization and glowing- oftentimes the result is a reddish cast.
Is the cast cold- like light magenta or warm like a salmon tint?
Just doing my detective work- let me know! I hope I can help.
Ed
