• Time in the dye bath
• Dye bath conditions:
• pH per manufacturer recommendations
• Temperature according to manufacturer instruction
• Dye concentration, per manufacturer instructions
• Use of high quality DI water to make up the dye bath,
or less than 5 microSeimens (<5 µS/cm) specific
conductance (equivalent to over 200,000 ohms
resistance)
• Activity of the dye bath, concerncing the amount of
contaminants dragged into the bath over time.
• The quality of the seal
• The inherent lightfastness of the dye itself
Many organic dyes are not lightfast, so all of these
factors can be controlled, though the dye may still fade
quickly. Dyes are graded on a scale from 1 to 8, or a scale
from 1 to 10, with the higher number being more lightfast.
Certain organic dyestuffs have sufficient lightfastness to
be used in outdoor architectural applications. Certain blue
dyes may be among this group, though I don't believe olive
green is one of them. Inorganic gold dye ferric ammonium
oxalate is commonly used in outdoor applications, whereas
organic golds/yellows are not particularly lightfast.
See also: short.pfonline.com/blackdye
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