Between depth of colour (K/S), DE_cmc and invidual L*CH (lightness, chroma, hue) parameters of a dyed fabric, which one would give best estimate of whether one sample has greater/lower dye fixation than another?
Here fixation would refer to how much dye has reactively bonded with the cellulose (as against dye uptake which refers to how much dye has diffused to the cellulose in total, bonded+non-bonded)
I am specifically looking at reactive dyeing, but other methods used with other dyeing techniques would also be of great help!
Dear Priyanshu Ranjan Gupta ,
The task is difficult and can only be made by comparison.
Even reactive dye may get trapped between cellulose fibers and straps that do not characterize a reaction.
The L*C*H may still be used to measure sensitive changes. However, the main task is to guarantee the correct relative measurement.
It is necessary to activate the cellulose surface (acid or basic activation; it depends on the chosen dye characteristics) and measure the total effect of bonded + non-bonded dye retention.
Since the bonded is affected by the surface activation (no desirable in principle), the non-bonded is the real measurement at the beginning.
Once obtained a reasonable idea of how much is the total effect by the L*C*H measurement, repeat the procedure without activating the cellulose surface.
Compare the changes between the measured activated surface and the non-activated cellulose surface.
As the activated cellulose surface has a limited reactive capability, the procedure's optimization will give a reliable dye amount of non-reactive adsorption.
Using the same dye and cellulose type, once known the adsorbed effect over the L*C*H reading, the non-activated surface will express the cellulose's relative natural reactivity for the same type of cellulose and surface characteristics.
It works quite nicely for some well-controlled final cellulose products.
Naturally, by changing the cellulose type and surface characteristics, this new condition must be probed; as said, it is a comparison measurement, usually reliable in the production line, by strictly applying the same process and quality control protocols.
I hope it helps somehow.
Best regards,
WNM
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