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To put a [[dye]] on something to change its colour and make it easier to see.
===References===
====AQA====
:[https://www.amazon.co.uk/gp/product/0008158754/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=0008158754&linkCode=as2&tag=nrjc-21&linkId=27ad53b0283feeff7fc5ae04a9e205f521 ''Stain, 120-1, GCSE Biology; Student Book, Collins, AQA '']