Seafood kare-kare (kare-kareng dagat or kare-kareng seafood) replaces the traditional oxtail or pork trotter with a combination of seafood — typically prawns/sugpo, squid/pusit, mussels/tahong, and sometimes crab or clams. The peanut butter sauce and annatto carotenoid are identical to meat-based kare-kare, so those components require the same treatment. What distinguishes seafood kare-kare as a carpet stain is the addition of squid ink — the most oxidation-resistant natural pigment encountered in Filipino cooking — combined with shrimp astaxanthin, and TMA odour from all the seafood components.
A seafood kare-kare spill where the squid was whole or partially ink-intact (pusit na may tinta) can produce a dark charcoal-black stain from the ink sac that is unlike any other Filipino food stain in its resistance to treatment. Three or more rounds of H2O2 may be needed for the ink component, and professional reductive bleaching treatment is sometimes the only path to full removal of concentrated squid ink from wool carpet.
Squid Ink Melanin: The Most Resistant Natural Stain
Cephalopod ink (tinta ng pusit) contains eumelanin — a high-molecular-weight polymer formed from 5,6-dihydroxyindole (DHI) and 5,6-dihydroxyindole-2-carboxylic acid (DHICA) monomers. Unlike synthetic dyes or simple carotenoid pigments, eumelanin is a disordered heteropolymer with no single defined structure — its absorption is broad-spectrum (absorbs across the entire visible range, producing the characteristic very dark colour) and it does not have discrete chromophore bonds that H2O2 can selectively oxidise. This is why melanin is resistant to bleaching: each H2O2 application degrades some melanin polymer chains, but the broad and disordered structure means many oxidation cycles are needed to fully decolourise it.
Squid ink also contains tyrosinase (the enzyme responsible for melanin polymerisation), mucopolysaccharides (which bind the ink to surfaces), and amino acids including L-DOPA — which can continue to polymerise into additional melanin after the spill if not rinsed quickly. Cold water blotting within the first 30 seconds is especially important for squid ink to stop the ongoing polymerisation process.
Shrimp and Mussel Components
Shrimp in seafood kare-kare contributes astaxanthin (if shell-on or head-on) and TMA from TMAO conversion, as in shrimp sinigang. The peanut butter sauce surrounds the shrimp astaxanthin, creating a fat-dissolved astaxanthin matrix that the baking soda phase begins to address. Mussels (tahong, Perna viridis — the green-lipped mussel common in Philippine cooking) contain higher haem content than shrimp (bivalve haem protein 0.1–0.5 mg/g, higher than shrimp flesh) and a dark blue-black shell pigment (mytilochrome) that can deposit on carpet. Mussel flesh is dark orange-grey and contributes moderate myoglobin (0.2–0.5 mg/g). Both shrimp and mussel components are addressed in the main treatment sequence without additional steps beyond the TMA vinegar treatment.
Treatment Sequence for Seafood Kare-Kare
Remove squid ink immediately — it polymerises on contact
If squid ink (black liquid) is visible in the spill, blot it with cold water within 30 seconds. Squid ink contains tyrosinase enzyme that continues to polymerise L-DOPA into new melanin after the spill. Every additional 30 seconds of contact allows more melanin polymerisation and deeper penetration into the carpet fibre.
- Blot with cold water immediately from the outside edge inward. Remove any solid seafood pieces (squid, shrimp, mussel) with a spoon. Remove shrimp shells and heads separately. If a squid ink sac was punctured in the spill, prioritise the black ink area for immediate cold water blotting first.
- Apply baking soda paste (1.5 tablespoons baking soda + 1 teaspoon cold water). Leave 25–28 minutes for the peanut butter sauce fat (50–55% fat content). The baking soda does not significantly address melanin, but it is essential for the dominant peanut fat component.
- Rinse baking soda with cold water. Blot dry.
- Apply enzyme cleaner (protease for seafood protein, lipase for peanut fat and shrimp head hepatopancreas fat). Leave 20–22 minutes with damp cloth cover.
- Rinse enzyme cleaner with cold water. Blot dry.
- Apply 3% hydrogen peroxide to the full stain area. Leave 10 minutes. Blot. Inspect: annatto bixin and shrimp astaxanthin will respond to the first round. Squid ink melanin will show minimal change after 1–2 rounds — this is expected. Apply second round (10 minutes). Apply third round if any melanin-black tint remains. Accept that full melanin removal may require 3–5 rounds over multiple treatment sessions on the same day, or professional reductive bleaching.
- Apply white vinegar solution (1 part white vinegar, 4 parts cold water) for 8 minutes to address TMA from all the seafood components. Blot dry.
- Rinse with cold water. Blot dry. Air-dry with ventilation.
Squid Ink vs Other Black/Dark Stains: Oxidation Resistance
| Dark Pigment | Chemical Class | H2O2 Response | Full Removal Difficulty |
|---|---|---|---|
| Squid ink melanin | Eumelanin (DHI/DHICA polymer) | Slow (3–5+ rounds) | Very High — may need reductive bleaching |
| Soy sauce melanoidins | Maillard polymer | Moderate (2–3 rounds) | High |
| Caramelised sugar | Caramelin polymer | Moderate (2–3 rounds) | High |
| Beef liver haem | Haem-keratin complex | Moderate (2 rounds) | Medium-High (if delayed) |
| Kangkong pheophytin | Pheophytin (chlorophyll) | Good (1–2 rounds) | Medium |
| Coffee melanoidins | Maillard polymer | Moderate (2 rounds) | Medium |
Seafood Kare-Kare or Squid Ink Stain in Sutherland Shire?
Squid ink eumelanin that has penetrated wool carpet backing beyond three H2O2 treatment rounds requires professional reductive bleaching — a specialist treatment that uses a sodium dithionite or thiourea dioxide reducing agent to decolourise oxidation-resistant melanin. Local carpet cleaning specialists serving Sutherland Shire can be matched through local referral networks.
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Frequently asked
What if the squid in the kare-kare was cleaned and had no ink?
Cleaned, de-inked squid (pusit na malinis) does not introduce melanin to the spill. Cleaned squid has very low myoglobin (0.05–0.10 mg/g — similar to tilapia), low fat (1–2%), and moderate TMAO/TMA. A seafood kare-kare with cleaned squid is treated as a peanut sauce + shrimp astaxanthin + TMA stain without the melanin complication. Follow the standard sequence with 25–28 minutes baking soda (for the peanut sauce fat), enzyme treatment, 2 rounds H2O2 (for annatto and astaxanthin), and the full vinegar TMA step. This is substantially easier than whole-squid kare-kare.
Does crab (alimasag or alimango) in the kare-kare change the treatment?
Crab in seafood kare-kare adds astaxanthin from the shells (same as shrimp — addressed in the H2O2 rounds) and crab roe aligue if present (high carotenoid concentration, addressed in the H2O2 rounds). Crab does not produce squid ink melanin. Remove crab shell fragments carefully before blotting (sharp edges embed in carpet pile). Crab roe adds 3–5 minutes to the baking soda phase due to the high lipid content in the roe. Otherwise the treatment sequence is unchanged.
The kare-kare sauce is on the carpet but there was no squid — do I still need the full sequence?
Yes — even without squid, seafood kare-kare sauce requires the full sequence because of the peanut butter fat load (50–55% fat) and annatto bixin. The TMA vinegar step is still needed for shrimp and mussel TMA. Reduce H2O2 rounds from potentially 3+ (for squid ink) to 2 rounds (for annatto and astaxanthin without melanin). The overall treatment is similar in length to vegetable kare-kare plus the TMA vinegar step.
The squid ink area on the carpet has turned grey rather than black after treatment — is that progress?
Yes — a shift from black to grey indicates that the H2O2 treatment is oxidising the outer layers of the melanin polymer. Each treatment round partially degrades the eumelanin from the surface down. Continue applying H2O2 rounds (allow 30 minutes between rounds to let the carpet dry and the oxidation progress before reapplying). After 3–4 rounds, if the stain remains grey rather than reaching the carpet's base colour, allow the carpet to dry completely (24 hours) before deciding on the next step — some melanin oxidation products continue to lighten as they dry, and the final result after full drying is typically lighter than the wet assessment suggests.
Octopus (pugita) was in the kare-kare instead of squid — does octopus have the same ink chemistry?
Yes — octopus ink (tinta ng pugita) is chemically nearly identical to squid ink: eumelanin polymer (DHI/DHICA), tyrosinase enzyme, and mucopolysaccharide binder. The resistance to H2O2 and the treatment sequence are the same. Octopus ink sacs are generally larger than squid ink sacs, so a punctured octopus ink sac in the kare-kare spill may release more ink volume than a squid would. The urgency to blot the black ink component within 30 seconds is the same.