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| 配方类型： |
METALS |
| 配方说明： |
Developing the Color |
| 配制方法： |
One or two seconds' exposure to a moist ammonia atmosphere will cause the formation of a dense insoluble dye in the unexposed areas of the aluminum. The background sometimes contains a white precipitate.
Dyes generally change color with pH. For this reason the final color appears only after the ammonia has completely evaporated. |
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