In the inv I mean

Like Changing the Text Color?

That would result in sth like that...:

tooltip.add(TextFormatting.GRAY + I18n.format("wand.efficiency") + ": " +
                        (getEfficiency() >= boundDefinition.getPerfectEfficiencyBorder() ? TextFormatting.GOLD : (getEfficiency() >= definition.getPerfectEfficiencyBorder() ? TextFormatting.AQUA : TextFormatting.DARK_BLUE)) +
                        Math.round(getEfficiency()) + "%");

More specifically, im referring to the TextFormatting.sth

Edited December 30, 20177 yr by Major Tuvok
Spelling mistake

Subscribe to ItemTooltipEvent to add information to the tooltip of items.

To change the color of item names, simply include "§" + any formatting codes before the name of the item in the lang file.

On 12/31/2017 at 11:07 AM, diesieben07 said:

No. Formatting codes should not appear in the lang file. Instead if you need a certain formatting in the language file, do the following:

I18n.format("my.language.key", TextFormatting.RED, TextFormatting.RESET);

And in the lang file:

my.language.key=This is an %1$simportant%2$s word, and here is %1$sanother%2$s.

in the addInformation method?