It's been a very long time since this patch saw any action (3 years), but I've never seen the colour issue before from what I recall.
The only things I can think of is that you have a version of the mod which layers the texture components differently from how the patch was made, it's a bug in that specific version of the mod, or the modpack messed with the config somehow.
I'm not going to check for an issue in a nondescript "Tekkit" pack. You need to provide more information (which Tekkit, which MC version, which mod version), but if I do update this patch it'll only be for MC1.12. That update will be on a very long list of things I'm not sure I'll ever get around to, however.