- Is for greasy, sticky and waxy surfaces (bag of potato chips)
- Is mixed with methanol, the alcohol evaporates and only the Sudan Black stain remains
- Non-porous surfaces - glass, metal, plastic and the inside of latex gloves
- can be on wet or dry surfaces
- reacts with the lipids/fats to develop print
Procedure:
- Using a tray, immerse item in Sudan Black for 2 minutes
- cold tap water rinse - removes excess dye
- dry item at room temperature
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