Tint and Color Accuracy

Thanks for your reply, but unfortunately does not seem to be the fix.
As you can see from the image, here are the planes with tint VS. the UI element itself VS. the values in a color picker.

I was mistaken.  My apologies. When I matched colour it was red (1,0,0) which was fine.

I tried a couple different methods but to no avail.  The colours D63737 and #d73636 show up the same as well.  I think it's likely that HW is limiting the colour depth for efficiency.  Hard to say, sometimes when I paste a HEX into the desktop editor the hex is different from what I copied.

Should file a bug report or maybe meta can jump in here to shed some light on this.  A possible workaround is to upload textures with the matching colours and just use them instead.  A pain, but if you're in a hurry...

import { Entity, Asset, Color, Vec3 } from 'horizon/core';
import { MeshEntity, MaterialAsset, Component, PropTypes } from 'horizon/core';

class SetUIOMaterial extends Component<typeof SetUIOMaterial> {
  static propsDefinition = {
    materialAsset: { type: PropTypes.Asset }
  };

  start() {
    this.entity.color.set(Color.fromHex("d93333"));
    //const hsvColor = new Vec3(0,0.76,0.85)
    //this.entity.color.set(Color.fromHSV(hsvColor));
    //this.entity.color.set(new Color(.85,0.2,0.2))
    const material = this.props.materialAsset?.as(MaterialAsset)!;
    const mesh = this.entity.as(MeshEntity)!;
    mesh.setMaterial(material)

  }
}

Component.register(SetUIOMaterial);