[alt-photo] Tea toned cyanotype

[Alberto Novo]

Lately, the cyanotype toning with tea or coffee is becoming a real fashion.
I am puzzled because it seems to me that most of what is perceived as color 
change may be just staining.
I tried to download some pictures from internet and change the white point 
by selecting it from the paper outside the image.
The result is that most of them return blue.
Do you think that this check may be assumed as a good indicator of the 
effectiveness of toning? 


Alberto
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