This is the ferrous powder and oxidising patina
Results on different types of paper
black card - hard to see and takes a very long time to see results. paper also warps alot
thick yellow card - the card doesnt soak the patina well and as a result creates small puddles that distort the silhouette of the object
Tissue - the tissue is too absorbent and the rust bleeds out too much
tracing paper - does not absorb patina well enough and dries too quickly
plain paper - warps a little but the results are easy to see and the patina is absorbed quite well
300gsm watercolour paper - absorbs the patina well and keeps the paper wet. due to its thickness does not warp much and also shows the result very well. (Winner)
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