Line One: Memorial Stones from Cremains

The Pearl + Marble Method Process Guide

Standard Operating Procedure | v2 — April 12, 2026

Stream A is a cremains business. Two distinct processes back to back: the Pearl Method turns sieved cremains into structurally sound BB-sized aggregate pearls via sodium silicate granulation; the Marble Method casts those pearls into Portland Type II concrete to produce the four catalog products, with the pearls visible at the finished surface as a marbled signature. Both processes work identically whether the input is from a hamster, a large dog, or a human. Product size is decoupled from cremains volume — the four flat-priced products in the catalog are the same size regardless of who the cremains came from.

1. PREPARATION & RITUAL

Consistent with the Bob Ross Standard, every session begins with a moment of focus.

• Intake Review: Read the customer's intake form out loud. Note the name of the deceased (pet or person), any stories shared by the family, and which product(s) the customer ordered.
• Workspace: Ensure the workbench is clear, level, and well-lit.
• Honoring the Remains: The cremains are kept in their original shipping container until the moment of sieving. We treat the entire volume with respect — every gram goes into the customer's product. We are "the pinch guy" to no one.

2. REFINEMENT (THE SIEVE)

Cremains are not uniform. To ensure a premium finish, they must be refined.

• Sieving: Sieve the cremains through a 20-mesh screen (for garden stones, candle holders, and the planter) or a 40-mesh screen (for worry stones — finer for hand-feel).
• Grinding: Any larger fragments are gently hand-ground using a mortar and pestle until they pass the mesh.
• Weigh and Log: Weigh the total sieved volume. This weight is logged on the order ticket and feeds the intake fee tier confirmation.

3. GRANULATION (THE PEARL METHOD) — new step in v2

This is the step that turns sieved cremains into the structural aggregate. The output is the Pearl-Method aggregate that gets cast into concrete in step 4 (the Marble Method). See Research/Pearl_Method.md for the chemistry.

• Equipment: 500mm 304 stainless laboratory disc pelletizer, ~45° tilt, 20–50 RPM. (Equipment_Inventory.md §3 — already in the inventory.)
• Binder: Liquid sodium silicate (Type N water glass), 50/50 with distilled water in a hand spray bottle.
• Load: Pour the sieved cremains into the spinning pan.
• Mist: Lightly mist the tumbling cremains. Within ~5 minutes, they snowball into uniform BB-sized pearls (~3–5 mm).
• Cure: Scoop the pearls onto a labeled tray. Air-cure for 24 hours. Pearls become rigid, waterproof, and chemically stable.
• Weigh and Log Yield: Final pearl weight goes on the order ticket. This determines whether the recipe needs pea gravel backfill (small yield) or whether the order will spill into a bonus unit (large yield).

4. THE MIX & CAST (THE MARBLE METHOD)

This is where the Pearl-Method aggregate is incorporated into Portland concrete and cast into the catalog molds. The "marble" name is descriptive: when the cured surface is sanded or polished, the pearls show through the cement matrix like veining or chips in real marble. Use the v2 recipes in Concrete_Mix_Recipes.md/Legacy%20Soil/Research/Concrete_Mix_Recipes.md). One recipe per product:

1. Worry Stone Set — white Portland + fine silica sand + customer's pearls (40-mesh)
2. Candle Holder Set of 4 — Portland Type II + sand + customer's pearls + silica fume (thermal)
3. Garden Stone — Portland Type II + sand + customer's pearls + air entrainer (freeze-thaw)
4. Cement Memorial Planter — Portland Type II + sand + customer's pearls + air entrainer + silica fume + drainage hole

For each:

• Dry Mix: Combine cement, sand, and the customer's cured pearls. Add pea gravel backfill (matched in size to pearls) if the pearl yield is below the target aggregate volume for the product. Mix until uniform.
• Water Addition: Add water at the specified water-to-cement ratio (recipe-specific — 0.38 worry, 0.42 candle holder, 0.45 garden / planter).
• Admixtures: Air-entraining admixture (Sika AEA-15) for outdoor recipes. Silica fume or fly ash for thermal (candle holders) and structural (planter) recipes.

5. CASTING & VIBRATION

• Mold Selection: Use the standard mold for the product the customer ordered. Mold size does not vary with cremains volume.
• Vibration: Place the filled mold on the vibrating table for 2–5 minutes. Critical for removing microscopic air bubbles and ensuring the "Bob Ross" smooth finish.
• Leveling: Strike off the top of the mold to a flat, even surface.
• Spillover Check: If the customer's pearl yield exceeds what one unit can hold, prepare a second cast of the same product. The second unit is gifted to the customer at no charge — no pearls are ever held back.

6. THE CURE

Concrete doesn't "dry" — it hydrates. The slower the cure, the stronger the cast.

• Initial Cure: Keep the mold under plastic sheeting in a temperature-controlled environment.

Worry stones: 48 hours Candle holders: 48 hours Garden stones: 7 days under damp burlap Planter: 7 days under damp burlap

• Microcement Overlay: Applied after the initial cure for worry stones, candle holders, and the planter rim. 1–2 mm thick, color-matched to the core.
• Final Air-Dry:

Worry stones: 5 days Candle holders: 14 days minimum before any lit use (thermal safety) Garden stones: 21 days Planter: 28 days before outdoor exposure; 60 days before first plant (prevents pH burn on roots)

7. FINISHING & PACKAGING

• Worry Stones: Apply microcement overlay (1–2 mm) and polish to 600-grit then 1200-grit for a glass finish.
• Candle Holders: Apply microcement overlay. Embed the metal candle cup (tea-light cup or 22-gauge steel taper insert). Inspect wall thickness — minimum 3/8" everywhere.
• Garden Stones: Inspect for sharp edges and sand lightly with 200-grit if necessary. Optional concrete penetrating sealer.
• Planter: Inspect drainage holes. Apply microcement to rim. Penetrating sealer over the whole surface.
• Packaging: Every product is wrapped in a dedicated memorial cloth, placed in a high-integrity shipping box, and accompanied by the "Unconditional Love" certificate and a seed-paper memory card.

[!TIP]

No-excess rule: Every gram of the customer's cremains goes into the customer's order. If the pearl yield exceeds one unit's capacity, prepare a free spillover unit. If the yield is below the unit's aggregate target, supplement with pea gravel backfill — the customer's pearls remain visible at the cast face. There is no scenario where a customer's cremains are pooled, held back, or discarded.