diff --git a/core/block_svg.ts b/core/block_svg.ts
index 1c1de49ec..10fa995ff 100644
--- a/core/block_svg.ts
+++ b/core/block_svg.ts
@@ -243,7 +243,7 @@ export class BlockSvg
    *
    * @returns #RRGGBB string.
    */
-  getColourSecondary(): string | undefined {
+  getColourSecondary(): string {
     return this.style.colourSecondary;
   }
 
@@ -252,7 +252,7 @@ export class BlockSvg
    *
    * @returns #RRGGBB string.
    */
-  getColourTertiary(): string | undefined {
+  getColourTertiary(): string {
     return this.style.colourTertiary;
   }
 
@@ -1172,6 +1172,15 @@ export class BlockSvg
     }
   }
 
+  /**
+   * Returns the BlockStyle object used to style this block.
+   *
+   * @returns This block's style object.
+   */
+  getStyle(): BlockStyle {
+    return this.style;
+  }
+
   /**
    * Move this block to the front of the visible workspace.
    * <g> tags do not respect z-index so SVG renders them in the
diff --git a/core/field_dropdown.ts b/core/field_dropdown.ts
index b1e3b5af2..bc2d2856f 100644
--- a/core/field_dropdown.ts
+++ b/core/field_dropdown.ts
@@ -291,7 +291,7 @@ export class FieldDropdown extends Field<string> {
 
     if (this.getConstants()!.FIELD_DROPDOWN_COLOURED_DIV) {
       const primaryColour = block.getColour();
-      const borderColour = (this.sourceBlock_ as BlockSvg).style.colourTertiary;
+      const borderColour = (this.sourceBlock_ as BlockSvg).getColourTertiary();
       dropDownDiv.setColour(primaryColour, borderColour);
     }
 
@@ -467,21 +467,21 @@ export class FieldDropdown extends Field<string> {
    * Updates the dropdown arrow to match the colour/style of the block.
    */
   override applyColour() {
-    const style = (this.sourceBlock_ as BlockSvg).style;
+    const sourceBlock = this.sourceBlock_ as BlockSvg;
     if (this.borderRect_) {
-      this.borderRect_.setAttribute('stroke', style.colourTertiary);
+      this.borderRect_.setAttribute('stroke', sourceBlock.getColourTertiary());
       if (this.menu_) {
-        this.borderRect_.setAttribute('fill', style.colourTertiary);
+        this.borderRect_.setAttribute('fill', sourceBlock.getColourTertiary());
       } else {
         this.borderRect_.setAttribute('fill', 'transparent');
       }
     }
     // Update arrow's colour.
-    if (this.sourceBlock_ && this.arrow) {
-      if (this.sourceBlock_.isShadow()) {
-        this.arrow.style.fill = style.colourSecondary;
+    if (sourceBlock && this.arrow) {
+      if (sourceBlock.isShadow()) {
+        this.arrow.style.fill = sourceBlock.getColourSecondary();
       } else {
-        this.arrow.style.fill = style.colourPrimary;
+        this.arrow.style.fill = sourceBlock.getColour();
       }
     }
   }
diff --git a/core/field_input.ts b/core/field_input.ts
index eecb4ec94..2c8a48e67 100644
--- a/core/field_input.ts
+++ b/core/field_input.ts
@@ -226,7 +226,7 @@ export abstract class FieldInput<T extends InputTypes> extends Field<
 
     if (!this.isFullBlockField() && this.borderRect_) {
       this.borderRect_!.style.display = 'block';
-      this.borderRect_.setAttribute('stroke', block.style.colourTertiary);
+      this.borderRect_.setAttribute('stroke', block.getColourTertiary());
     } else {
       this.borderRect_!.style.display = 'none';
       // In general, do *not* let fields control the color of blocks. Having the
@@ -429,8 +429,8 @@ export abstract class FieldInput<T extends InputTypes> extends Field<
       borderRadius = (bBox.bottom - bBox.top) / 2 + 'px';
       // Pull stroke colour from the existing shadow block
       const strokeColour = block.getParent()
-        ? (block.getParent() as BlockSvg).style.colourTertiary
-        : (this.sourceBlock_ as BlockSvg).style.colourTertiary;
+        ? (block.getParent() as BlockSvg).getColourTertiary()
+        : (this.sourceBlock_ as BlockSvg).getColourTertiary();
       htmlInput.style.border = 1 * scale + 'px solid ' + strokeColour;
       div!.style.borderRadius = borderRadius;
       div!.style.transition = 'box-shadow 0.25s ease 0s';
diff --git a/core/icons/comment_icon.ts b/core/icons/comment_icon.ts
index ea120ca17..24a276d87 100644
--- a/core/icons/comment_icon.ts
+++ b/core/icons/comment_icon.ts
@@ -126,7 +126,7 @@ export class CommentIcon extends Icon implements IHasBubble, ISerializable {
 
   override applyColour(): void {
     super.applyColour();
-    const colour = (this.sourceBlock as BlockSvg).style.colourPrimary;
+    const colour = (this.sourceBlock as BlockSvg).getColour();
     this.textInputBubble?.setColour(colour);
   }
 
diff --git a/core/icons/mutator_icon.ts b/core/icons/mutator_icon.ts
index d02c7e187..eea533eab 100644
--- a/core/icons/mutator_icon.ts
+++ b/core/icons/mutator_icon.ts
@@ -136,7 +136,7 @@ export class MutatorIcon extends Icon implements IHasBubble {
 
   override applyColour(): void {
     super.applyColour();
-    this.miniWorkspaceBubble?.setColour(this.sourceBlock.style.colourPrimary);
+    this.miniWorkspaceBubble?.setColour(this.sourceBlock.getColour());
     this.miniWorkspaceBubble?.updateBlockStyles();
   }
 
diff --git a/core/icons/warning_icon.ts b/core/icons/warning_icon.ts
index 2744195f9..b82ad1097 100644
--- a/core/icons/warning_icon.ts
+++ b/core/icons/warning_icon.ts
@@ -108,7 +108,7 @@ export class WarningIcon extends Icon implements IHasBubble {
 
   override applyColour(): void {
     super.applyColour();
-    this.textBubble?.setColour(this.sourceBlock.style.colourPrimary);
+    this.textBubble?.setColour(this.sourceBlock.getColour());
   }
 
   override updateCollapsed(): void {
diff --git a/core/renderers/zelos/path_object.ts b/core/renderers/zelos/path_object.ts
index 060190ee1..a46d355b6 100644
--- a/core/renderers/zelos/path_object.ts
+++ b/core/renderers/zelos/path_object.ts
@@ -68,7 +68,7 @@ export class PathObject extends BasePathObject {
     // Set shadow stroke colour.
     const parent = block.getParent();
     if (block.isShadow() && parent) {
-      this.svgPath.setAttribute('stroke', parent.style.colourTertiary);
+      this.svgPath.setAttribute('stroke', parent.getColourTertiary());
     }
 
     // Apply colour to outlines.