Sergio,
I'm not familiar with the availability of chemicals in Bogota or how easy could be to place an order from outside the country. In any case, the SBR obtained from pyrocat-hd divided is amazing. Sandy helped me to find the right concentration and I developed some 35mm for testing. Check this sample, exposed for the shade and still you are able to see the white tower blasted by the sun in the background. Not adjustment was made, just invert.
Armando
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